feat: 支付闭环 + 运营助手 Tool Calling + 管理后台完善

- 支付系统：微信支付 mock 自动完成、NATIVE 扫码支付、JSAPI 集成
- 运营助手：Tool Calling 架构，19 个可执行工具，AI 驱动操作
- 角色管理：表格布局 + Dialog 表单 + 权限勾选
- 配置统一：config.ts 单一数据源
- API 审计：补齐 status toggle / comments 端点
- 暗黑模式硬件编码颜色全部替换为 CSS 变量

frontend/src/app/admin/contents/[id]/edit-content.tsx

@@ -7,6 +7,7 @@ import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
 import { Card } from '@/components/ui/card';
 import { Skeleton } from '@/components/ui/skeleton';
+import { API_BASE } from '@/lib/config';
 
 export default function EditContentPage() {
   const params = useParams();
@@ -17,7 +18,7 @@ export default function EditContentPage() {
 
   useEffect(() => { loadContent(); }, [params.id]);
 
-  const base = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3000';
+  const base = API_BASE;
   function token() { return localStorage.getItem('adminToken'); }
   function headers() {
     const t = token();
@@ -26,7 +27,7 @@ export default function EditContentPage() {
 
   async function loadContent() {
     try {
-      const res = await fetch(`${base}/api/v1/contents/${params.id}`, { headers: headers() });
+      const res = await fetch(`${base}/contents/${params.id}`, { headers: headers() });
       if (res.ok) {
         const data = await res.json();
         setForm({ title: data.title || '', summary: data.summary || '', content: data.content || '', cover: data.cover || '', contentType: data.contentType || 'article' });
@@ -40,7 +41,7 @@ export default function EditContentPage() {
     if (!form.title.trim() || !form.content.trim()) return;
     setSubmitting(true);
     try {
-      const res = await fetch(`${base}/api/v1/contents/${params.id}`, {
+      const res = await fetch(`${base}/contents/${params.id}`, {
         method: 'PUT', headers: headers(), body: JSON.stringify(form),
       });
       if (res.ok) router.push('/admin/contents');