feat: 公开首页(搜索+商品详情) + 好心人投稿 + 后台审核收纳

- 公开前端 SPA（根路径 /）：首页大搜索框、检索结果、只读商品详情、贡献档案表单
- 公开写入端点 POST /api/public/submissions（无需登录，基础频率限流），投稿进入 submission 待审核队列，不直接写 product
- 迁移 0006：submission 投稿表 + community 来源(trust=0.50)
- 后台审核队列：列表(待审核/已通过/已驳回) → 查看投稿 → 通过(创建/补全商品 + 记 source=community + 字段级溯源 + 审计 + 重算质量分) / 驳回(记原因)
- 公开只读 api 服务内嵌公开 SPA；Dockerfile.prod 增加 node 构建阶段 + 内嵌 dist

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

api/internal/adminhandler/handler.go

@@ -8,6 +8,7 @@ import (
 	"io/fs"
 	"net/http"
 	"strings"
+	"time"
 
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
@@ -18,16 +19,23 @@ import (
 
 // Handler holds the admin dependencies.
 type Handler struct {
-	store    *adminstore.Store
-	authn    *auth.Authenticator
-	basePath string
-	spa      fs.FS
+	store       *adminstore.Store
+	authn       *auth.Authenticator
+	basePath    string
+	spa         fs.FS
+	submitLimit *rateLimiter
 }
 
 // New constructs an admin Handler. basePath is e.g. "/ping" (no trailing slash).
 func New(store *adminstore.Store, authn *auth.Authenticator, basePath string, spa fs.FS) *Handler {
 	basePath = "/" + strings.Trim(basePath, "/")
-	return &Handler{store: store, authn: authn, basePath: basePath, spa: spa}
+	return &Handler{
+		store:       store,
+		authn:       authn,
+		basePath:    basePath,
+		spa:         spa,
+		submitLimit: newRateLimiter(5, 10*time.Minute),
+	}
 }
 
 // Router builds the HTTP handler.
@@ -56,10 +64,21 @@ func (h *Handler) Router() http.Handler {
 			r.Delete("/api/products/{id}/msrp/{msrpID}", h.DeleteMSRP)
 			r.Get("/api/brands", h.ListBrands)
 			r.Get("/api/categories", h.ListCategories)
+
+			r.Get("/api/submissions", h.ListSubmissions)
+			r.Get("/api/submissions/{id}", h.GetSubmission)
+			r.Post("/api/submissions/{id}/approve", h.ApproveSubmission)
+			r.Post("/api/submissions/{id}/reject", h.RejectSubmission)
 		})
 
 		r.Handle("/*", http.HandlerFunc(h.serveSPA))
 	})
+
+	// Public, unauthenticated contribution endpoint (proxied at /api/public/*).
+	// Submissions enter a moderation queue and never touch products until an
+	// admin approves them.
+	r.Post("/api/public/submissions", h.CreateSubmission)
+
 	return r
 }
 
@@ -230,8 +249,91 @@ func (h *Handler) ListCategories(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, map[string]any{"items": items})
 }
 
+// ---------- submissions ----------
+
+// CreateSubmission accepts an anonymous public contribution into the queue.
+func (h *Handler) CreateSubmission(w http.ResponseWriter, r *http.Request) {
+	if !h.submitLimit.allow(realIP(r)) {
+		writeError(w, http.StatusTooManyRequests, "rate_limited", "提交过于频繁，请稍后再试")
+		return
+	}
+	var in adminstore.SubmissionInput
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 1<<20)).Decode(&in); err != nil {
+		writeError(w, http.StatusBadRequest, "bad_request", "invalid body")
+		return
+	}
+	if strings.TrimSpace(in.Name) == "" {
+		writeError(w, http.StatusBadRequest, "bad_request", "商品名称不能为空")
+		return
+	}
+	id, err := h.store.CreateSubmission(r.Context(), in, realIP(r))
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "internal_error", err.Error())
+		return
+	}
+	writeJSON(w, http.StatusCreated, map[string]string{"id": id, "status": "pending"})
+}
+
+// ListSubmissions returns the moderation queue (admin).
+func (h *Handler) ListSubmissions(w http.ResponseWriter, r *http.Request) {
+	status := r.URL.Query().Get("status")
+	page, size := pageParams(r)
+	items, total, err := h.store.ListSubmissions(r.Context(), status, size, (page-1)*size)
+	if h.handleErr(w, err) {
+		return
+	}
+	pending, _ := h.store.PendingSubmissionCount(r.Context())
+	writeJSON(w, http.StatusOK, map[string]any{
+		"items": items, "page": page, "size": size, "total": total, "pending": pending,
+	})
+}
+
+// GetSubmission returns full submission detail (admin).
+func (h *Handler) GetSubmission(w http.ResponseWriter, r *http.Request) {
+	d, err := h.store.GetSubmission(r.Context(), chi.URLParam(r, "id"))
+	if h.handleErr(w, err) {
+		return
+	}
+	writeJSON(w, http.StatusOK, d)
+}
+
+// ApproveSubmission applies a contribution to the product store (admin).
+func (h *Handler) ApproveSubmission(w http.ResponseWriter, r *http.Request) {
+	d, err := h.store.ApproveSubmission(r.Context(), chi.URLParam(r, "id"), auth.UserFrom(r.Context()))
+	if h.handleErr(w, err) {
+		return
+	}
+	writeJSON(w, http.StatusOK, d)
+}
+
+// RejectSubmission rejects a contribution with a reviewer note (admin).
+func (h *Handler) RejectSubmission(w http.ResponseWriter, r *http.Request) {
+	var body struct {
+		Note string `json:"note"`
+	}
+	_ = json.NewDecoder(r.Body).Decode(&body)
+	err := h.store.RejectSubmission(r.Context(), chi.URLParam(r, "id"), auth.UserFrom(r.Context()), body.Note)
+	if h.handleErr(w, err) {
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]string{"status": "rejected"})
+}
+
 // ---------- helpers ----------
 
+func realIP(r *http.Request) string {
+	if ip := r.Header.Get("X-Forwarded-For"); ip != "" {
+		if i := strings.IndexByte(ip, ','); i >= 0 {
+			return strings.TrimSpace(ip[:i])
+		}
+		return strings.TrimSpace(ip)
+	}
+	if ip := r.Header.Get("X-Real-IP"); ip != "" {
+		return ip
+	}
+	return r.RemoteAddr
+}
+
 func (h *Handler) handleErr(w http.ResponseWriter, err error) bool {
 	if err == nil {
 		return false
@@ -240,6 +342,10 @@ func (h *Handler) handleErr(w http.ResponseWriter, err error) bool {
 		writeError(w, http.StatusNotFound, "not_found", "资源不存在")
 		return true
 	}
+	if errors.Is(err, adminstore.ErrConflict) {
+		writeError(w, http.StatusConflict, "conflict", "该投稿已被处理")
+		return true
+	}
 	writeError(w, http.StatusInternalServerError, "internal_error", err.Error())
 	return true
 }