feat: add conversation search and usage dashboard

.trellis/tasks/08-03-advanced-conversation-search/references/source-assets/manifest.json

@@ -0,0 +1,10 @@
+{
+  "name": "advanced-search-reference",
+  "role": "完整视觉参考",
+  "original_path": "sessions/_attachments/237582ef-4157-4175-84fa-38629613df7f.png",
+  "archived_path": "references/source-assets/advanced-search-reference.png",
+  "sha256": "39e5b93d26deca64ea88a46b09bed7f7c47d2af733e8f2f857a9d35fc7895692",
+  "size": [733, 673],
+  "format": "PNG RGBA",
+  "usage": "仅用于构图与视觉验收，不进入运行时"
+}