feat: 界面全部改为中文

- 侧边栏导航：仪表盘、登录、内容浏览、发布、互动、API 测试、设置
- 7 个页面所有按钮、标签、提示、错误信息改为中文
- API 端点列表分类改为中文（登录、内容、发布、互动）
- 组件内文本：展开/收起、复制、点赞、收藏、评论等
- 页面标题改为 Social MCP - 管理后台

web/src/components/feed/FeedDetail.tsx

@@ -40,7 +40,7 @@ export function FeedDetail({ feedId, xsecToken, onClose, onUserClick }: Props) {
       <div className="absolute inset-0 bg-black/60" onClick={onClose} />
       <div className="relative ml-auto w-full max-w-2xl bg-dark-card border-l border-dark-border overflow-y-auto">
         <div className="sticky top-0 bg-dark-card border-b border-dark-border px-5 py-3 flex items-center justify-between z-10">
-          <h3 className="font-semibold truncate">Feed Detail</h3>
+          <h3 className="font-semibold truncate">笔记详情</h3>
           <button onClick={onClose} className="text-dark-muted hover:text-dark-text text-xl">&times;</button>
         </div>
 
@@ -85,7 +85,7 @@ export function FeedDetail({ feedId, xsecToken, onClose, onUserClick }: Props) {
             {/* Video */}
             {detail.videoUrl && (
               <div className="rounded-xl overflow-hidden bg-dark-bg p-4">
-                <Badge variant="info">Video Note</Badge>
+                <Badge variant="info">视频笔记</Badge>
                 <p className="text-xs text-dark-muted mt-2 break-all">{detail.videoUrl}</p>
               </div>
             )}
@@ -108,10 +108,10 @@ export function FeedDetail({ feedId, xsecToken, onClose, onUserClick }: Props) {
             {/* Stats */}
             <div className="grid grid-cols-4 gap-3">
               {[
-                { label: 'Likes', value: detail.likeCount },
-                { label: 'Collects', value: detail.collectCount },
-                { label: 'Comments', value: detail.commentCount },
-                { label: 'Shares', value: detail.shareCount },
+                { label: '点赞', value: detail.likeCount },
+                { label: '收藏', value: detail.collectCount },
+                { label: '评论', value: detail.commentCount },
+                { label: '分享', value: detail.shareCount },
               ].map((s) => (
                 <div key={s.label} className="bg-dark-bg rounded-lg p-3 text-center">
                   <p className="text-lg font-bold">{formatNumber(s.value)}</p>
@@ -145,14 +145,14 @@ export function FeedDetail({ feedId, xsecToken, onClose, onUserClick }: Props) {
                   variant="ghost"
                   onClick={() => void navigator.clipboard.writeText(detail.id)}
                 >
-                  Copy Feed ID
+                  复制 Feed ID
                 </Button>
                 <Button
                   size="sm"
                   variant="ghost"
                   onClick={() => void navigator.clipboard.writeText(detail.xsecToken)}
                 >
-                  Copy Token
+                  复制 Token
                 </Button>
               </div>
             </div>
@@ -161,7 +161,7 @@ export function FeedDetail({ feedId, xsecToken, onClose, onUserClick }: Props) {
             {detail.comments.length > 0 && (
               <div>
                 <h3 className="text-sm font-semibold text-dark-muted uppercase tracking-wider mb-3">
-                  Comments ({detail.comments.length})
+                  评论 ({detail.comments.length})
                 </h3>
                 <CommentTree comments={detail.comments} />
               </div>