feat: Studio 概览/分析补上阅读量 + 详情页 meta 行改版

- StudioOverview 新增 TotalViews 字段，GetOverviewByUserID 查询含 SUM(views_count)
- 新增 ViewTrendStore 接口和 AggregateViewsByAuthor，UNION ALL 合并已登录+访客阅读日志按日期聚合
- 数据分析页面新增阅读量趋势折线图（绿色，Chart.js）
- 概览和数据分析页面新增总阅读量统计卡片
- 详情页 meta 行改为标签格式：作者/阅读/点赞/收藏/评论/发布时间
- 移除详情页公开状态徽章，已锁定+理由仅作者可见

templates/MetaLab-2026/html/posts/show.html

@@ -8,13 +8,14 @@
         <header class="post-detail-header">
             <h1 class="post-detail-title">{{.Post.Title}}</h1>
             <div class="post-detail-meta">
-                <span class="post-author">{{if .Post.AuthorName}}{{.Post.AuthorName}}{{else}}该用户已注销{{end}}</span>
-                <span class="post-time">{{.Post.CreatedAt.Format "2006-01-02 15:04"}}</span>
-                {{if ne .Post.Status "approved"}}
-                <span class="post-status post-status-{{.Post.Status}}">{{index $.StatusNames .Post.Status}}</span>
-                {{end}}
-                {{if .Post.IsLocked}}
-                <span class="post-status post-status-locked">已锁定</span>
+                <span>作者：{{if .Post.AuthorName}}{{.Post.AuthorName}}{{else}}该用户已注销{{end}}</span>
+                <span>阅读：{{.Post.ViewsCount}}</span>
+                <span>点赞：{{.Post.LikesCount}}</span>
+                <span>收藏：{{.Post.FavoritesCount}}</span>
+                <span>评论：{{.Post.CommentsCount}}</span>
+                <span>发布时间：{{.Post.CreatedAt.Format "2006-01-02 15:04"}}</span>
+                {{if and .Post.IsLocked (eq $.Post.UserID $.UID)}}
+                <span class="post-status post-status-locked">已锁定{{if .Post.LockReason}}：{{.Post.LockReason}}{{end}}</span>
                 {{end}}
                 {{if and .Post.PendingBody (eq $.Post.UserID $.UID)}}
                 <span class="post-status post-status-revision">修订审核中</span>