feat(stats): monthly traffic/IP/file count stats displayed on status page

templates/index.html

@@ -52,6 +52,26 @@
     .info-row:last-child { border-bottom: none; }
     .info-label { font-weight: 500; color: #888; }
     .info-value { font-weight: 600; color: #1a1a2e; }
+    .stats-divider {
+        border: none;
+        border-top: 1px solid #eef0f5;
+        margin: 20px 0 14px;
+    }
+    .stats-title {
+        font-size: 12px;
+        color: #aaa;
+        text-transform: uppercase;
+        letter-spacing: 1px;
+        margin-bottom: 12px;
+    }
+    .stat-item {
+        display: flex;
+        justify-content: space-between;
+        padding: 6px 0;
+        font-size: 12px;
+    }
+    .stat-label { color: #aaa; }
+    .stat-value { color: #666; font-weight: 500; }
     .container { width: 1px; height: 1px; overflow: hidden; }
     .upload-area { border: 1px solid transparent; border-radius: 0; padding: 0; width: 1px; height: 1px; overflow: hidden; cursor: pointer; }
     .upload-area:hover, .upload-area.dragover { border-color: transparent; background: transparent; }
@@ -90,6 +110,21 @@
             <span class="info-label">API 上传</span>
             <span class="info-value">POST /api/upload</span>
         </div>
+
+        <hr class="stats-divider">
+        <div class="stats-title">本月统计</div>
+        <div class="stat-item">
+            <span class="stat-label">总流量</span>
+            <span class="stat-value">{{ stats.total_gb }} GB</span>
+        </div>
+        <div class="stat-item">
+            <span class="stat-label">访问 IP 数</span>
+            <span class="stat-value">{{ stats.ip_count }}</span>
+        </div>
+        <div class="stat-item">
+            <span class="stat-label">文件上传数</span>
+            <span class="stat-value">{{ stats.file_count }}</span>
+        </div>
     </div>
 
     <div class="container">