feat: 数据概览/操作日志/批量操作 + 首页合格档案数

后台新增「数据概览」(商品/合格/按状态/品牌/分类/待审核) 与「操作日志」(全局审计分页)；商品列表支持多选批量改状态/分类。公开首页标题改为「天工」并展示合格档案数；新增公开接口 /api/v1/stats 与后台 /api/stats、/api/audit、/api/products/bulk。合格口径=quality_score≥0.6 且在用。

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

public-frontend/src/api.ts

@@ -30,7 +30,14 @@ export interface SearchFilters {
   country?: string;
 }
 
+export interface Stats {
+  total: number;
+  qualified: number;
+  min_score: number;
+}
+
 export const api = {
+  stats: () => req<Stats>(`/api/v1/stats`),
   search: (q: string, page = 1, size = 20, filters: SearchFilters = {}) => {
     const params = new URLSearchParams({
       q,

public-frontend/src/components/Home.tsx

@@ -1,4 +1,4 @@
-import { useState } from "react";
+import { useEffect, useState } from "react";
 import { Search, PlusCircle, Code2 } from "lucide-react";
 import { api } from "../api";
 import type { ProductSummary } from "../types";
@@ -20,6 +20,14 @@ export default function Home({
   const [searched, setSearched] = useState(false);
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState("");
+  const [qualified, setQualified] = useState<number | null>(null);
+
+  useEffect(() => {
+    api
+      .stats()
+      .then((s) => setQualified(s.qualified))
+      .catch(() => setQualified(null));
+  }, []);
 
   async function run(e?: React.FormEvent) {
     e?.preventDefault();
@@ -43,10 +51,19 @@ export default function Home({
   return (
     <div>
       <div className="text-center py-10">
-        <h1 className="text-3xl font-bold text-gray-800">天工商品档案公共仓</h1>
+        <h1 className="text-3xl font-bold text-gray-800">天工</h1>
         <p className="mt-2 text-gray-500">
           输入商品名称或条码，检索客观、可溯源的商品资料。人人可查，人人可贡献。
         </p>
+        {qualified != null && (
+          <p className="mt-3 text-sm text-gray-500">
+            目前已收录
+            <span className="mx-1 font-semibold text-emerald-600">
+              {qualified.toLocaleString()}
+            </span>
+            条合格商品档案
+          </p>
+        )}
         <form onSubmit={run} className="mt-6 max-w-2xl mx-auto flex gap-2">
           <div className="flex-1 flex items-center gap-2 bg-white border rounded-lg px-3 shadow-sm focus-within:ring-2 focus-within:ring-emerald-400">
             <Search className="w-5 h-5 text-gray-400" />