移除不准确的 feedCount 和 shareCount 字段，新增用户主页入口

- 删除 UserProfile.feedCount（tab 选择器已失效，改用 feeds.length 展示）
- 删除 FeedDetail.shareCount（实际无法获取分享数）
- 用户信息栏新增"主页"按钮，点击查看当前登录用户主页
- extractInitialState 补充 userProfile/homeFeed/explore key 提取

web/src/api/types.ts

@@ -42,7 +42,6 @@ export interface FeedDetail {
   likeCount: number;
   collectCount: number;
   commentCount: number;
-  shareCount: number;
   isLiked: boolean;
   isFavorited: boolean;
   createTime: string;
@@ -74,7 +73,6 @@ export interface UserProfile {
   follows: number;
   fans: number;
   interaction: number;
-  feedCount: number;
   feeds: Feed[];
 }
 

web/src/components/feed/FeedDetail.tsx

@@ -194,7 +194,6 @@ export function FeedDetail({ feedId, xsecToken, onClose, onUserClick }: Props) {
                 { 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>

web/src/components/feed/UserCard.tsx

@@ -54,12 +54,11 @@ export function UserCard({ userId, xsecToken, onFeedSelect }: Props) {
       </div>
 
       {/* Stats */}
-      <div className="grid grid-cols-4 gap-3">
+      <div className="grid grid-cols-3 gap-3">
         {[
           { label: '关注', value: profile.follows },
           { label: '粉丝', value: profile.fans },
           { label: '获赞与收藏', value: profile.interaction },
-          { label: '笔记', value: profile.feedCount },
         ].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>

web/src/pages/XiaohongshuPage.tsx

@@ -261,6 +261,11 @@ export function XiaohongshuPage() {
                   <span className="text-xs text-dark-muted">{status.userId.slice(0, 12)}…</span>
                 )}
               </div>
+              {status.userId && (
+                <Button size="sm" variant="secondary" onClick={() => setUserView({ userId: status.userId!, xsecToken: '' })}>
+                  主页
+                </Button>
+              )}
               <Button size="sm" variant="danger" onClick={() => void handleLogout()} loading={logoutLoading}>
                 退出
               </Button>