feat: 可扩展档案模式框架 + 内置 3C(电子) 模式

- 新增 category.archive_kind 与 kind_field 字段模板表（迁移 0010）
- 种子 electronics 字段模板 + 3C 品类树（手机/笔记本/平板等）
- 后端按档案模式动态计算完整度/合格：食品沿用 food_detail，
  其它模式走 product.attributes + kind_field
- 新增 GET /api/kind-fields?kind= 接口
- 后台编辑页按品类模式动态渲染规格参数表单
- 公开详情页/接口输出带标签的规格表

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

api/internal/adminhandler/handler.go

@@ -84,6 +84,7 @@ func (h *Handler) Router() http.Handler {
 			r.Put("/api/brands/{id}", h.UpdateBrand)
 			r.Post("/api/brands/{id}/merge", h.MergeBrands)
 			r.Delete("/api/brands/{id}", h.DeleteBrand)
+			r.Get("/api/kind-fields", h.ListKindFields)
 			r.Get("/api/categories", h.ListCategories)
 			r.Post("/api/categories", h.CreateCategory)
 			r.Put("/api/categories/{id}", h.UpdateCategory)
@@ -423,6 +424,20 @@ func (h *Handler) ListBrands(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, map[string]any{"items": items})
 }
 
+// ListKindFields returns the editable spec field template for an archive kind.
+func (h *Handler) ListKindFields(w http.ResponseWriter, r *http.Request) {
+	kind := strings.TrimSpace(r.URL.Query().Get("kind"))
+	if kind == "" {
+		writeError(w, http.StatusBadRequest, "bad_request", "缺少 kind 参数")
+		return
+	}
+	items, err := h.store.ListKindFields(r.Context(), kind)
+	if h.handleErr(w, err) {
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]any{"items": items, "kind": kind})
+}
+
 // ListCategories returns category options.
 func (h *Handler) ListCategories(w http.ResponseWriter, r *http.Request) {
 	items, err := h.store.ListCategories(r.Context())

api/internal/adminstore/adminstore.go

@@ -64,10 +64,15 @@ func (s *Store) ListProducts(ctx context.Context, q string, limit, offset int) (
 		return nil, 0, err
 	}
 
+	qualified, err := s.kindQualifiedKeys(ctx, s.pool)
+	if err != nil {
+		return nil, 0, err
+	}
+
 	args = append(args, limit, offset)
 	sql := `
 SELECT p.id, p.gtin, p.name, b.name, c.path::text, p.status, p.quality_score,
-       p.updated_at,
+       p.updated_at, COALESCE(c.archive_kind, 'generic'), p.attributes,
        (p.brand_id IS NOT NULL) AS has_brand,
        (p.category_id IS NOT NULL) AS has_cat,
        (p.net_content_canonical IS NOT NULL) AS has_net,
@@ -91,13 +96,21 @@ LEFT JOIN food_detail f ON f.product_id = p.id ` + where +
 	for rows.Next() {
 		var r ProductRow
 		var hasBrand, hasCat, hasNet, hasCountry, hasNutri, hasIng, hasImg bool
+		var kind string
+		var attributes []byte
 		var updated time.Time
 		if err := rows.Scan(&r.ID, &r.GTIN, &r.Name, &r.Brand, &r.CategoryPath, &r.Status,
-			&r.QualityScore, &updated, &hasBrand, &hasCat, &hasNet, &hasCountry,
+			&r.QualityScore, &updated, &kind, &attributes,
+			&hasBrand, &hasCat, &hasNet, &hasCountry,
 			&hasNutri, &hasIng, &hasImg); err != nil {
 			return nil, 0, err
 		}
 		r.UpdatedAt = updated.Format(time.RFC3339)
+		attrs := map[string]any{}
+		if len(attributes) > 0 {
+			_ = json.Unmarshal(attributes, &attrs)
+		}
+		qkeys := qualified[kind]
 		present := map[string]bool{
 			"name":              r.Name != "",
 			"gtin":              r.GTIN != nil && *r.GTIN != "",
@@ -109,8 +122,11 @@ LEFT JOIN food_detail f ON f.product_id = p.id ` + where +
 			"ingredients":       hasIng,
 			"image":             hasImg,
 		}
+		for _, k := range qkeys {
+			present[k] = attrPresent(attrs, k)
+		}
 		r.Missing = []string{}
-		for _, f := range CompletenessFields {
+		for _, f := range completenessKeys(kind, qkeys) {
 			if !present[f] {
 				r.Missing = append(r.Missing, f)
 			}
@@ -150,6 +166,8 @@ type ProductDetail struct {
 	Brand           *string        `json:"brand"`
 	CategoryID      *string        `json:"category_id"`
 	CategoryPath    *string        `json:"category_path"`
+	ArchiveKind     string         `json:"archive_kind"`
+	Attributes      map[string]any `json:"attributes"`
 	NetContentValue *float64       `json:"net_content_value"`
 	NetContentUnit  *string        `json:"net_content_unit"`
 	CountryOfOrigin *string        `json:"country_of_origin"`
@@ -173,9 +191,11 @@ type ProductDetail struct {
 func (s *Store) GetProduct(ctx context.Context, id string) (*ProductDetail, error) {
 	var d ProductDetail
 	var nutriments []byte
+	var attributes []byte
 	var updated time.Time
 	err := s.pool.QueryRow(ctx, `
 SELECT p.id, p.gtin, p.name, p.brand_id, b.name, p.category_id, c.path::text,
+       COALESCE(c.archive_kind, 'generic'), p.attributes,
        p.net_content_value, p.net_content_unit, p.country_of_origin, p.status,
        p.quality_score, p.updated_at,
        f.ingredients_text, f.allergens, f.additives, f.nutriments,
@@ -186,6 +206,7 @@ LEFT JOIN category c ON c.id = p.category_id
 LEFT JOIN food_detail f ON f.product_id = p.id
 WHERE p.id = $1`, id).Scan(
 		&d.ID, &d.GTIN, &d.Name, &d.BrandID, &d.Brand, &d.CategoryID, &d.CategoryPath,
+		&d.ArchiveKind, &attributes,
 		&d.NetContentValue, &d.NetContentUnit, &d.CountryOfOrigin, &d.Status,
 		&d.QualityScore, &updated,
 		&d.IngredientsText, &d.Allergens, &d.Additives, &nutriments,
@@ -198,6 +219,10 @@ WHERE p.id = $1`, id).Scan(
 		return nil, err
 	}
 	d.UpdatedAt = updated.Format(time.RFC3339)
+	d.Attributes = map[string]any{}
+	if len(attributes) > 0 {
+		_ = json.Unmarshal(attributes, &d.Attributes)
+	}
 	if len(nutriments) > 0 {
 		_ = json.Unmarshal(nutriments, &d.Nutriments)
 	}
@@ -226,11 +251,15 @@ WHERE p.id = $1`, id).Scan(
 	}
 	d.MSRP = msrps
 
-	d.Missing = missingFromDetail(&d)
+	qualified, err := s.kindQualifiedKeys(ctx, s.pool)
+	if err != nil {
+		return nil, err
+	}
+	d.Missing = missingFromDetail(&d, qualified[d.ArchiveKind])
 	return &d, nil
 }
 
-func missingFromDetail(d *ProductDetail) []string {
+func missingFromDetail(d *ProductDetail, qualifiedAttrKeys []string) []string {
 	present := map[string]bool{
 		"name":              d.Name != "",
 		"gtin":              d.GTIN != nil && *d.GTIN != "",
@@ -242,8 +271,11 @@ func missingFromDetail(d *ProductDetail) []string {
 		"ingredients":       d.IngredientsText != nil && *d.IngredientsText != "",
 		"image":             len(d.Images) > 0,
 	}
+	for _, k := range qualifiedAttrKeys {
+		present[k] = attrPresent(d.Attributes, k)
+	}
 	missing := []string{}
-	for _, f := range CompletenessFields {
+	for _, f := range completenessKeys(d.ArchiveKind, qualifiedAttrKeys) {
 		if !present[f] {
 			missing = append(missing, f)
 		}

api/internal/adminstore/category.go

@@ -96,11 +96,12 @@ func (s *Store) CreateCategory(ctx context.Context, actor string, in CategoryInp
 
 	parentPath := ""
 	parentLevel := -1
+	kind := DefaultKind
 	var parentID *string
 	if pid := trimPtr(in.ParentID); pid != nil {
 		var path string
 		var level int
-		err := s.pool.QueryRow(ctx, "SELECT path::text, level FROM category WHERE id = $1", *pid).Scan(&path, &level)
+		err := s.pool.QueryRow(ctx, "SELECT path::text, level, archive_kind FROM category WHERE id = $1", *pid).Scan(&path, &level, &kind)
 		if errors.Is(err, pgx.ErrNoRows) {
 			return nil, ErrInvalidParent
 		}
@@ -119,11 +120,11 @@ func (s *Store) CreateCategory(ctx context.Context, actor string, in CategoryInp
 
 	var c Category
 	err := s.pool.QueryRow(ctx, `
-INSERT INTO category (name_zh, name_en, parent_id, path, gpc_brick_code, level)
-VALUES ($1, $2, $3, $4::ltree, $5, $6)
-RETURNING id, name_zh, name_en, path::text, level, parent_id::text, gpc_brick_code, 0`,
-		name, trimPtr(in.NameEN), parentID, path, trimPtr(in.GPCBrickCode), level).
-		Scan(&c.ID, &c.NameZH, &c.NameEN, &c.Path, &c.Level, &c.ParentID, &c.GPCBrickCode, &c.ProductCount)
+INSERT INTO category (name_zh, name_en, parent_id, path, gpc_brick_code, level, archive_kind)
+VALUES ($1, $2, $3, $4::ltree, $5, $6, $7)
+RETURNING id, name_zh, name_en, path::text, level, parent_id::text, gpc_brick_code, archive_kind, 0`,
+		name, trimPtr(in.NameEN), parentID, path, trimPtr(in.GPCBrickCode), level, kind).
+		Scan(&c.ID, &c.NameZH, &c.NameEN, &c.Path, &c.Level, &c.ParentID, &c.GPCBrickCode, &c.ArchiveKind, &c.ProductCount)
 	if isUniqueViolation(err) {
 		return nil, ErrDuplicatePath
 	}
@@ -273,10 +274,10 @@ func (s *Store) getCategory(ctx context.Context, id string) (*Category, error) {
 	var c Category
 	err := s.pool.QueryRow(ctx, `
 SELECT c.id, c.name_zh, c.name_en, c.path::text, c.level, c.parent_id::text,
-       c.gpc_brick_code,
+       c.gpc_brick_code, c.archive_kind,
        (SELECT count(*) FROM product p WHERE p.category_id = c.id)
 FROM category c WHERE c.id = $1`, id).
-		Scan(&c.ID, &c.NameZH, &c.NameEN, &c.Path, &c.Level, &c.ParentID, &c.GPCBrickCode, &c.ProductCount)
+		Scan(&c.ID, &c.NameZH, &c.NameEN, &c.Path, &c.Level, &c.ParentID, &c.GPCBrickCode, &c.ArchiveKind, &c.ProductCount)
 	if errors.Is(err, pgx.ErrNoRows) {
 		return nil, ErrNotFound
 	}

api/internal/adminstore/kind.go

@@ -0,0 +1,101 @@
+package adminstore
+
+import "context"
+
+// DefaultKind is used for products whose category has no archive kind (or no
+// category at all).
+const DefaultKind = "generic"
+
+// FoodKind keeps the mature, dedicated food_detail path; every other kind is
+// driven generically by kind_field + product.attributes.
+const FoodKind = "food"
+
+// genericBaseFields are the core completeness fields for any non-food kind.
+// Food keeps its own richer CompletenessFields list.
+var genericBaseFields = []string{"name", "gtin", "brand", "category", "image"}
+
+// KindField describes one editable spec field for an archive kind. It drives
+// both the dynamic admin form and the kind-aware completeness computation.
+type KindField struct {
+	Kind        string   `json:"kind"`
+	FieldKey    string   `json:"field_key"`
+	GroupLabel  string   `json:"group_label"`
+	LabelZH     string   `json:"label_zh"`
+	FieldType   string   `json:"field_type"`
+	Unit        *string  `json:"unit"`
+	Options     []string `json:"options"`
+	Placeholder *string  `json:"placeholder"`
+	SortOrder   int      `json:"sort_order"`
+	Qualified   bool     `json:"qualified"`
+}
+
+// ListKindFields returns the ordered field template for one archive kind.
+func (s *Store) ListKindFields(ctx context.Context, kind string) ([]KindField, error) {
+	rows, err := s.pool.Query(ctx, `
+SELECT kind, field_key, group_label, label_zh, field_type, unit, options,
+       placeholder, sort_order, qualified
+FROM kind_field WHERE kind = $1 ORDER BY sort_order, field_key`, kind)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := []KindField{}
+	for rows.Next() {
+		var f KindField
+		if err := rows.Scan(&f.Kind, &f.FieldKey, &f.GroupLabel, &f.LabelZH,
+			&f.FieldType, &f.Unit, &f.Options, &f.Placeholder, &f.SortOrder,
+			&f.Qualified); err != nil {
+			return nil, err
+		}
+		out = append(out, f)
+	}
+	return out, rows.Err()
+}
+
+// kindQualifiedKeys returns, per kind, the attribute keys that count toward the
+// completeness/qualified score. Loaded in one query so list views stay cheap.
+func (s *Store) kindQualifiedKeys(ctx context.Context, q queryer) (map[string][]string, error) {
+	rows, err := s.pool.Query(ctx,
+		"SELECT kind, field_key FROM kind_field WHERE qualified ORDER BY sort_order, field_key")
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	m := map[string][]string{}
+	for rows.Next() {
+		var kind, key string
+		if err := rows.Scan(&kind, &key); err != nil {
+			return nil, err
+		}
+		m[kind] = append(m[kind], key)
+	}
+	return m, rows.Err()
+}
+
+// completenessKeys returns the ordered list of field keys that define a full
+// archive for the given kind.
+func completenessKeys(kind string, qualifiedAttrKeys []string) []string {
+	if kind == FoodKind {
+		return CompletenessFields
+	}
+	keys := make([]string, 0, len(genericBaseFields)+len(qualifiedAttrKeys))
+	keys = append(keys, genericBaseFields...)
+	keys = append(keys, qualifiedAttrKeys...)
+	return keys
+}
+
+// attrPresent reports whether an attribute value is meaningfully filled in.
+func attrPresent(attrs map[string]any, key string) bool {
+	v, ok := attrs[key]
+	if !ok || v == nil {
+		return false
+	}
+	switch t := v.(type) {
+	case string:
+		return t != ""
+	case []any:
+		return len(t) > 0
+	default:
+		return true
+	}
+}

api/internal/adminstore/kind_test.go

@@ -0,0 +1,119 @@
+package adminstore
+
+import (
+	"context"
+	"testing"
+)
+
+// contains reports whether s holds v.
+func contains(s []string, v string) bool {
+	for _, x := range s {
+		if x == v {
+			return true
+		}
+	}
+	return false
+}
+
+// electronicsCategoryID returns the seeded electronics.phone category id,
+// skipping the test when the archive-kind migration is not applied.
+func electronicsCategoryID(t *testing.T, s *Store) string {
+	t.Helper()
+	ctx := context.Background()
+	var hasTable bool
+	if err := s.pool.QueryRow(ctx, "SELECT to_regclass('public.kind_field') IS NOT NULL").Scan(&hasTable); err != nil || !hasTable {
+		t.Skip("archive-kind migration not applied (kind_field missing)")
+	}
+	var id string
+	err := s.pool.QueryRow(ctx, "SELECT id FROM category WHERE path = 'electronics.phone'::ltree").Scan(&id)
+	if err != nil {
+		t.Skipf("electronics.phone category not seeded: %v", err)
+	}
+	return id
+}
+
+func TestListKindFieldsElectronics(t *testing.T) {
+	s := newTestStore(t)
+	electronicsCategoryID(t, s) // ensures migration applied
+	fields, err := s.ListKindFields(context.Background(), "electronics")
+	if err != nil {
+		t.Fatalf("list kind fields: %v", err)
+	}
+	if len(fields) == 0 {
+		t.Fatal("expected seeded electronics fields, got none")
+	}
+	var sawQualified bool
+	for _, f := range fields {
+		if f.FieldKey == "model_number" && f.Qualified {
+			sawQualified = true
+		}
+	}
+	if !sawQualified {
+		t.Fatal("expected model_number to be a qualified field")
+	}
+}
+
+// TestElectronicsArchiveKind verifies a non-food product uses the electronics
+// completeness rules: food fields (nutriments/ingredients) are not required,
+// and qualified spec fields drive both "missing" and the quality score.
+func TestElectronicsArchiveKind(t *testing.T) {
+	s := newTestStore(t)
+	ctx := context.Background()
+	catID := electronicsCategoryID(t, s)
+
+	created, err := s.CreateProduct(ctx, "tester", ProductInput{
+		Name:       "测试手机 " + randomHex(6),
+		CategoryID: &catID,
+	})
+	if err != nil {
+		t.Fatalf("create product: %v", err)
+	}
+	t.Cleanup(func() { _, _ = s.pool.Exec(ctx, "DELETE FROM product WHERE id = $1", created.ID) })
+
+	if created.ArchiveKind != "electronics" {
+		t.Fatalf("archive_kind = %q, want electronics", created.ArchiveKind)
+	}
+	// Food-only completeness fields must not be required for electronics.
+	if contains(created.Missing, "nutriments") || contains(created.Missing, "ingredients") {
+		t.Fatalf("electronics product should not require food fields: missing=%v", created.Missing)
+	}
+	// Qualified spec fields should appear as missing while empty.
+	for _, k := range []string{"model_number", "ccc_cert", "screen_size"} {
+		if !contains(created.Missing, k) {
+			t.Fatalf("expected %q in missing, got %v", k, created.Missing)
+		}
+	}
+
+	scoreBefore := created.QualityScore
+
+	gtin := "69" + randomHex(11)
+	brand := "TestPhoneCo"
+	updated, err := s.UpdateProduct(ctx, created.ID, "tester", ProductInput{
+		Name:       created.Name,
+		GTIN:       &gtin,
+		BrandName:  &brand,
+		CategoryID: &catID,
+		Status:     "active",
+		Attributes: map[string]any{
+			"model_number": "X-100",
+			"ccc_cert":     "2024010101234567",
+			"screen_size":  "6.1",
+			"color":        "黑色",
+		},
+	})
+	if err != nil {
+		t.Fatalf("update product: %v", err)
+	}
+
+	if got := updated.Attributes["model_number"]; got != "X-100" {
+		t.Fatalf("attributes not persisted: %v", updated.Attributes)
+	}
+	for _, k := range []string{"model_number", "ccc_cert", "screen_size"} {
+		if contains(updated.Missing, k) {
+			t.Fatalf("%q should be filled, still missing: %v", k, updated.Missing)
+		}
+	}
+	if updated.QualityScore <= scoreBefore {
+		t.Fatalf("quality should rise after filling fields: before=%v after=%v", scoreBefore, updated.QualityScore)
+	}
+}

api/internal/adminstore/quality.go

@@ -2,6 +2,7 @@ package adminstore
 
 import (
 	"context"
+	"encoding/json"
 	"math"
 	"time"
 
@@ -58,35 +59,56 @@ func (s *Store) computeQuality(ctx context.Context, q queryer, productID string)
 	var netCanonical *float64
 	var ingredients *string
 	var hasNutri, hasImage bool
+	var kind string
+	var attributes []byte
 	err := q.QueryRow(ctx, `
 SELECT p.name, p.gtin, p.brand_id, p.category_id, p.net_content_canonical,
-       p.country_of_origin, f.ingredients_text,
+       p.country_of_origin, COALESCE(c.archive_kind, 'generic'), p.attributes,
+       f.ingredients_text,
        (f.nutriments IS NOT NULL AND f.nutriments::text <> '{}'),
        EXISTS (SELECT 1 FROM product_image pi WHERE pi.product_id = p.id)
-FROM product p LEFT JOIN food_detail f ON f.product_id = p.id
+FROM product p
+LEFT JOIN category c ON c.id = p.category_id
+LEFT JOIN food_detail f ON f.product_id = p.id
 WHERE p.id = $1`, productID).Scan(
 		&name, &gtin, &brandID, &categoryID, &netCanonical, &country,
-		&ingredients, &hasNutri, &hasImage)
+		&kind, &attributes, &ingredients, &hasNutri, &hasImage)
 	if err != nil {
 		return 0, err
 	}
 
+	attrs := map[string]any{}
+	if len(attributes) > 0 {
+		_ = json.Unmarshal(attributes, &attrs)
+	}
+	qualified, err := s.kindQualifiedKeys(ctx, s.pool)
+	if err != nil {
+		return 0, err
+	}
+	qkeys := qualified[kind]
+
+	known := map[string]bool{
+		"name":              name != nil && *name != "",
+		"gtin":              gtin != nil && *gtin != "",
+		"brand":             brandID != nil,
+		"category":          categoryID != nil,
+		"net_content":       netCanonical != nil,
+		"country_of_origin": country != nil && *country != "",
+		"nutriments":        hasNutri,
+		"ingredients":       ingredients != nil && *ingredients != "",
+		"image":             hasImage,
+	}
+	for _, k := range qkeys {
+		known[k] = attrPresent(attrs, k)
+	}
+	keys := completenessKeys(kind, qkeys)
 	present := 0
-	bump := func(ok bool) {
-		if ok {
+	for _, k := range keys {
+		if known[k] {
 			present++
 		}
 	}
-	bump(name != nil && *name != "")
-	bump(gtin != nil && *gtin != "")
-	bump(brandID != nil)
-	bump(categoryID != nil)
-	bump(netCanonical != nil)
-	bump(country != nil && *country != "")
-	bump(hasNutri)
-	bump(ingredients != nil && *ingredients != "")
-	bump(hasImage)
-	completeness := float64(present) / float64(len(CompletenessFields))
+	completeness := float64(present) / float64(len(keys))
 
 	var sourceCount int
 	var sourceTrust *float64

api/internal/adminstore/write.go

@@ -27,6 +27,9 @@ type ProductInput struct {
 	NutritionBasis  *string        `json:"nutrition_basis"`
 	ServingSize     *string        `json:"serving_size"`
 	NutriScore      *string        `json:"nutri_score"`
+	// Attributes carries non-food spec values (driven by kind_field) for the
+	// generic archive kinds. Nil means "leave unchanged".
+	Attributes map[string]any `json:"attributes"`
 }
 
 func normBrand(name string) string { return strings.Join(strings.Fields(strings.ToLower(name)), " ") }
@@ -86,10 +89,11 @@ func (s *Store) UpdateProduct(ctx context.Context, id, actor string, in ProductI
 		brandID = &bid
 	}
 
-	// Resolve category gpc brick code.
+	// Resolve category gpc brick code + archive kind.
 	var gpc *string
+	kind := DefaultKind
 	if in.CategoryID != nil && *in.CategoryID != "" {
-		if err := tx.QueryRow(ctx, "SELECT gpc_brick_code FROM category WHERE id = $1", *in.CategoryID).Scan(&gpc); err != nil && !errors.Is(err, pgx.ErrNoRows) {
+		if err := tx.QueryRow(ctx, "SELECT gpc_brick_code, archive_kind FROM category WHERE id = $1", *in.CategoryID).Scan(&gpc, &kind); err != nil && !errors.Is(err, pgx.ErrNoRows) {
 			return nil, err
 		}
 	}
@@ -116,19 +120,28 @@ WHERE id=$11`,
 		return nil, err
 	}
 
-	var nutriJSON []byte
-	if in.Nutriments != nil {
-		nutriJSON, _ = json.Marshal(in.Nutriments)
+	// Non-food spec values live in product.attributes (nil means unchanged).
+	if in.Attributes != nil {
+		attrJSON, _ := json.Marshal(in.Attributes)
+		if _, err = tx.Exec(ctx, "UPDATE product SET attributes=$1 WHERE id=$2", attrJSON, id); err != nil {
+			return nil, err
+		}
 	}
-	allergens := in.Allergens
-	if allergens == nil {
-		allergens = []string{}
-	}
-	additives := in.Additives
-	if additives == nil {
-		additives = []string{}
-	}
-	_, err = tx.Exec(ctx, `
+
+	if kind == FoodKind {
+		var nutriJSON []byte
+		if in.Nutriments != nil {
+			nutriJSON, _ = json.Marshal(in.Nutriments)
+		}
+		allergens := in.Allergens
+		if allergens == nil {
+			allergens = []string{}
+		}
+		additives := in.Additives
+		if additives == nil {
+			additives = []string{}
+		}
+		_, err = tx.Exec(ctx, `
 INSERT INTO food_detail (product_id, ingredients_text, allergens, additives,
    nutriments, nutrition_basis, serving_size, nutri_score)
 VALUES ($1,$2,$3,$4,$5,$6,$7,$8)
@@ -140,10 +153,11 @@ ON CONFLICT (product_id) DO UPDATE SET
    nutrition_basis=EXCLUDED.nutrition_basis,
    serving_size=EXCLUDED.serving_size,
    nutri_score=EXCLUDED.nutri_score`,
-		id, in.IngredientsText, allergens, additives,
-		nutriJSON, in.NutritionBasis, in.ServingSize, in.NutriScore)
-	if err != nil {
-		return nil, err
+			id, in.IngredientsText, allergens, additives,
+			nutriJSON, in.NutritionBasis, in.ServingSize, in.NutriScore)
+		if err != nil {
+			return nil, err
+		}
 	}
 
 	if _, err := s.recomputeQualityTx(ctx, tx, id); err != nil {
@@ -284,6 +298,9 @@ func diffFields(a, b *ProductDetail) []string {
 	add("nutrition_basis", strEq(a.NutritionBasis, b.NutritionBasis))
 	add("serving_size", strEq(a.ServingSize, b.ServingSize))
 	add("nutri_score", strEq(a.NutriScore, b.NutriScore))
+	aa, _ := json.Marshal(a.Attributes)
+	ab, _ := json.Marshal(b.Attributes)
+	add("attributes", string(aa) == string(ab))
 	return changed
 }
 
@@ -442,6 +459,7 @@ type Category struct {
 	Level        int     `json:"level"`
 	ParentID     *string `json:"parent_id"`
 	GPCBrickCode *string `json:"gpc_brick_code"`
+	ArchiveKind  string  `json:"archive_kind"`
 	ProductCount int     `json:"product_count"`
 }
 
@@ -450,7 +468,7 @@ type Category struct {
 func (s *Store) ListCategories(ctx context.Context) ([]Category, error) {
 	rows, err := s.pool.Query(ctx, `
 SELECT c.id, c.name_zh, c.name_en, c.path::text, c.level, c.parent_id::text,
-       c.gpc_brick_code,
+       c.gpc_brick_code, c.archive_kind,
        (SELECT count(*) FROM product p WHERE p.category_id = c.id) AS product_count
 FROM category c
 ORDER BY c.path`)
@@ -462,7 +480,7 @@ ORDER BY c.path`)
 	for rows.Next() {
 		var c Category
 		if err := rows.Scan(&c.ID, &c.NameZH, &c.NameEN, &c.Path, &c.Level,
-			&c.ParentID, &c.GPCBrickCode, &c.ProductCount); err != nil {
+			&c.ParentID, &c.GPCBrickCode, &c.ArchiveKind, &c.ProductCount); err != nil {
 			return nil, err
 		}
 		out = append(out, c)

api/internal/store/store.go

@@ -4,8 +4,10 @@ package store
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
 	"strconv"
+	"strings"
 
 	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
@@ -56,6 +58,15 @@ type Barcode struct {
 	IsPrimary bool    `json:"is_primary"`
 }
 
+// ProductSpec is one labeled spec line for a non-food product, rendered from
+// the product's attributes JSONB against its archive kind's field template.
+type ProductSpec struct {
+	Key   string `json:"key"`
+	Label string `json:"label"`
+	Value string `json:"value"`
+	Unit  string `json:"unit,omitempty"`
+}
+
 // Product is the full public view of a product.
 type Product struct {
 	ID              string         `json:"id"`
@@ -64,11 +75,13 @@ type Product struct {
 	Brand           *string        `json:"brand"`
 	CategoryPath    *string        `json:"category_path"`
 	GPCBrickCode    *string        `json:"gpc_brick_code"`
+	ArchiveKind     string         `json:"archive_kind"`
 	NetContentValue *float64       `json:"net_content_value"`
 	NetContentUnit  *string        `json:"net_content_unit"`
 	CountryOfOrigin *string        `json:"country_of_origin"`
 	QualityScore    float64        `json:"quality_score"`
 	Barcodes        []Barcode      `json:"barcodes"`
+	Specs           []ProductSpec  `json:"specs,omitempty"`
 	Nutriments      map[string]any `json:"nutriments,omitempty"`
 	NutritionBasis  *string        `json:"nutrition_basis,omitempty"`
 	NutriScore      *string        `json:"nutri_score,omitempty"`
@@ -120,6 +133,7 @@ type SearchFilters struct {
 
 const productSelect = `
 SELECT p.id, p.gtin, p.name, b.name, c.path::text, p.gpc_brick_code,
+       COALESCE(c.archive_kind, 'generic'), p.attributes,
        p.net_content_value, p.net_content_unit, p.country_of_origin, p.quality_score,
        f.nutriments, f.nutrition_basis, f.nutri_score, f.ingredients_text,
        f.allergens, f.additives
@@ -129,21 +143,81 @@ LEFT JOIN category c ON c.id = p.category_id
 LEFT JOIN food_detail f ON f.product_id = p.id
 `
 
-func scanProduct(row pgx.Row) (*Product, error) {
+func scanProduct(row pgx.Row) (*Product, []byte, error) {
 	var p Product
+	var attributes []byte
 	err := row.Scan(
 		&p.ID, &p.GTIN, &p.Name, &p.Brand, &p.CategoryPath, &p.GPCBrickCode,
+		&p.ArchiveKind, &attributes,
 		&p.NetContentValue, &p.NetContentUnit, &p.CountryOfOrigin, &p.QualityScore,
 		&p.Nutriments, &p.NutritionBasis, &p.NutriScore, &p.Ingredients,
 		&p.Allergens, &p.Additives,
 	)
 	if errors.Is(err, pgx.ErrNoRows) {
-		return nil, ErrNotFound
+		return nil, nil, ErrNotFound
 	}
+	if err != nil {
+		return nil, nil, err
+	}
+	return &p, attributes, nil
+}
+
+// buildSpecs renders the labeled, ordered spec list for a non-food product from
+// its attributes JSONB against its archive kind's field template.
+func (s *Store) buildSpecs(ctx context.Context, kind string, attributes []byte) ([]ProductSpec, error) {
+	if kind == "" || kind == "food" || len(attributes) == 0 {
+		return nil, nil
+	}
+	attrs := map[string]any{}
+	if err := json.Unmarshal(attributes, &attrs); err != nil || len(attrs) == 0 {
+		return nil, nil
+	}
+	rows, err := s.pool.Query(ctx,
+		"SELECT field_key, label_zh, COALESCE(unit, '') FROM kind_field WHERE kind = $1 ORDER BY sort_order, field_key", kind)
 	if err != nil {
 		return nil, err
 	}
-	return &p, nil
+	defer rows.Close()
+	specs := []ProductSpec{}
+	for rows.Next() {
+		var key, label, unit string
+		if err := rows.Scan(&key, &label, &unit); err != nil {
+			return nil, err
+		}
+		v, ok := attrs[key]
+		if !ok || v == nil {
+			continue
+		}
+		val := stringifyAttr(v)
+		if val == "" {
+			continue
+		}
+		specs = append(specs, ProductSpec{Key: key, Label: label, Value: val, Unit: unit})
+	}
+	return specs, rows.Err()
+}
+
+// stringifyAttr renders a JSON attribute value as display text.
+func stringifyAttr(v any) string {
+	switch t := v.(type) {
+	case string:
+		return t
+	case float64:
+		return strconv.FormatFloat(t, 'f', -1, 64)
+	case bool:
+		if t {
+			return "是"
+		}
+		return "否"
+	case []any:
+		parts := make([]string, 0, len(t))
+		for _, e := range t {
+			parts = append(parts, stringifyAttr(e))
+		}
+		return strings.Join(parts, "、")
+	default:
+		return ""
+	}
 }
 
 // ProductByGTIN looks up an active product by any of its barcodes.
@@ -154,26 +228,32 @@ func (s *Store) ProductByGTIN(ctx context.Context, gtin string) (*Product, error
          SELECT 1 FROM product_barcode pb
          WHERE pb.product_id = p.id AND pb.gtin = $1))
  LIMIT 1`, gtin)
-	p, err := scanProduct(row)
+	p, attrs, err := scanProduct(row)
 	if err != nil {
 		return nil, err
 	}
 	if p.Barcodes, err = s.ProductBarcodes(ctx, p.ID); err != nil {
 		return nil, err
 	}
+	if p.Specs, err = s.buildSpecs(ctx, p.ArchiveKind, attrs); err != nil {
+		return nil, err
+	}
 	return p, nil
 }
 
 // ProductByID looks up a product by its UUID.
 func (s *Store) ProductByID(ctx context.Context, id string) (*Product, error) {
 	row := s.pool.QueryRow(ctx, productSelect+" WHERE p.id = $1", id)
-	p, err := scanProduct(row)
+	p, attrs, err := scanProduct(row)
 	if err != nil {
 		return nil, err
 	}
 	if p.Barcodes, err = s.ProductBarcodes(ctx, p.ID); err != nil {
 		return nil, err
 	}
+	if p.Specs, err = s.buildSpecs(ctx, p.ArchiveKind, attrs); err != nil {
+		return nil, err
+	}
 	return p, nil
 }