feat(ui): add maintenance page for task management

* Implement maintenance page with task and log display
* Add backfill and metadata retry functionality
* Integrate grid component for project display in thoughts page
* Update types for maintenance tasks and logs
* Enhance sidebar and shell for new maintenance navigation

migrations/001_enable_vector.sql

@@ -1,2 +1,3 @@
 create extension if not exists vector;
 create extension if not exists pgcrypto;
+CREATE EXTENSION IF NOT EXISTS pg_trgm;