Update extension system and database migrations

Changes:
- Added CLAUDE.md with project instructions
- Updated extension manifest bindings (TypeScript)
- Regenerated database migrations (consolidated into single migration)
- Updated haex schema with table name handling
- Enhanced extension manager and manifest handling in Rust
- Updated extension store in frontend
- Updated vault.db

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src-tauri/database/migrations/meta/_journal.json

@@ -5,15 +5,8 @@
     {
       "idx": 0,
       "version": "6",
-      "when": 1761430560028,
-      "tag": "0000_secret_ender_wiggin",
-      "breakpoints": true
-    },
-    {
-      "idx": 1,
-      "version": "6",
-      "when": 1761581351395,
-      "tag": "0001_late_the_renegades",
+      "when": 1761821821609,
+      "tag": "0000_dashing_night_nurse",
       "breakpoints": true
     }
   ]