feat: add project usage analytics with ECharts

.trellis/tasks/08-03-usage-statistics-dashboard-refit/references/source-assets/manifest.json

@@ -0,0 +1,11 @@
+{
+  "source": "/home/cc-web/sessions/_attachments/cb0a0566-dc77-489b-8e04-183bbb0bd172.png",
+  "archived_as": "usage-statistics-dashboard-reference.png",
+  "role": "完整参考原型，仅用于视觉对照",
+  "width": 1467,
+  "height": 943,
+  "format": "PNG RGBA",
+  "size_bytes": 1412493,
+  "sha256": "ddbcc605cdcd4ea6aab943b4fa101c1e4af7e1c729fa090d1c89d847e2fdf91d",
+  "runtime_asset": false
+}