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/studio/analytics.html

@@ -37,6 +37,13 @@
                     <span class="stat-card-label">草稿</span>
                 </div>
             </div>
+            <div class="stat-card">
+                <div class="stat-card-icon">👁</div>
+                <div class="stat-card-body">
+                    <span class="stat-card-value">{{.Overview.TotalViews}}</span>
+                    <span class="stat-card-label">总阅读量</span>
+                </div>
+            </div>
         </div>
 
         <div class="studio-section">
@@ -78,6 +85,13 @@
                     </div>
                     <div class="trends-loading" id="favoritesLoading">加载中...</div>
                 </div>
+                <div class="trends-card">
+                    <h3 class="trends-card-title">阅读量</h3>
+                    <div class="trends-chart-wrap">
+                        <canvas id="viewsChart"></canvas>
+                    </div>
+                    <div class="trends-loading" id="viewsLoading">加载中...</div>
+                </div>
             </div>
         </div>
         {{end}}
@@ -98,7 +112,8 @@
         energy: { border: '#f59e0b', bg: 'rgba(245, 158, 11, 0.1)' },
         comments: { border: '#3b82f6', bg: 'rgba(59, 130, 246, 0.1)' },
         likes: { border: '#ef4444', bg: 'rgba(239, 68, 68, 0.1)' },
-        favorites: { border: '#8b5cf6', bg: 'rgba(139, 92, 246, 0.1)' }
+        favorites: { border: '#8b5cf6', bg: 'rgba(139, 92, 246, 0.1)' },
+        views: { border: '#10b981', bg: 'rgba(16, 185, 129, 0.1)' }
     };
 
     function fillDates(points, days) {
@@ -193,8 +208,9 @@
         showLoading('commentsLoading');
         showLoading('likesLoading');
         showLoading('favoritesLoading');
+        showLoading('viewsLoading');
 
-        var canvasIds = ['energyChart', 'commentsChart', 'likesChart', 'favoritesChart'];
+        var canvasIds = ['energyChart', 'commentsChart', 'likesChart', 'favoritesChart', 'viewsChart'];
         canvasIds.forEach(function (id) {
             var canvas = document.getElementById(id);
             canvas.style.display = 'none';
@@ -217,7 +233,8 @@
                     { id: 'energyChart', key: 'energy', color: chartColors.energy, label: '赋能值', loading: 'energyLoading' },
                     { id: 'commentsChart', key: 'comments', color: chartColors.comments, label: '评论', loading: 'commentsLoading' },
                     { id: 'likesChart', key: 'likes', color: chartColors.likes, label: '点赞', loading: 'likesLoading' },
-                    { id: 'favoritesChart', key: 'favorites', color: chartColors.favorites, label: '收藏', loading: 'favoritesLoading' }
+                    { id: 'favoritesChart', key: 'favorites', color: chartColors.favorites, label: '收藏', loading: 'favoritesLoading' },
+                    { id: 'viewsChart', key: 'views', color: chartColors.views, label: '阅读', loading: 'viewsLoading' }
                 ];
 
                 maps.forEach(function (m) {