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/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)