feat: add conversation search and usage dashboard

.trellis/tasks/08-03-advanced-conversation-search/task.json

@@ -0,0 +1,33 @@
+{
+  "id": "advanced-conversation-search",
+  "name": "advanced-conversation-search",
+  "title": "高级会话检索",
+  "description": "",
+  "status": "completed",
+  "dev_type": null,
+  "scope": null,
+  "package": null,
+  "priority": "P2",
+  "creator": "shiyue",
+  "assignee": "shiyue",
+  "createdAt": "2026-08-03",
+  "completedAt": "2026-08-03",
+  "branch": null,
+  "base_branch": "main",
+  "worktree_path": null,
+  "commit": null,
+  "pr_url": null,
+  "subtasks": [],
+  "children": [],
+  "parent": null,
+  "relatedFiles": [
+    "lib/session-search-index.js",
+    "server.js",
+    "public/index.html",
+    "public/app.js",
+    "public/style.css",
+    "scripts/regression.js"
+  ],
+  "notes": "高级会话检索已完成专项、全量回归和 1672/1440/390 三视口真实 Chromium 验收。",
+  "meta": {}
+}