fix: restore API response formats + ai-ui-control ws + profile fields

- Restore {plugins: [...], total: N} for /plugins and /plugins/active-manifests
  (flat array broke frontend PluginRegistry → no menu items → empty UI)
- Restore {count: N} for /notifications/unread-count
  (scalar broke frontend notification badge)
- Fix ai_ui_control: on_install → on_activate for WS manager registration
  (WS 403 on every reconnect after container restart)
- Fix double /api/v1 prefix in useAIContext.ts and SuggestionBadge.tsx
- Add first_name, last_name, avatar_url to User model + migration 0032
- Extend UserUpdate schema with profile + password change fields
- Extend user_service.update_user with profile fields + password change
- Extend frontend UserResponse/UserUpdate types

app/routes/plugins.py

@@ -50,7 +50,7 @@ async def list_plugins(
     """List all plugins with their current status (discovered, installed, active, inactive)."""
     service = get_plugin_service()
     plugins = await service.list_plugins(db)
-    return plugins
+    return {"plugins": plugins, "total": len(plugins)}
 
 
 @router.get("/manifest")
@@ -76,7 +76,7 @@ async def get_active_manifests(
     """
     service = get_plugin_service()
     manifests = await service.get_active_manifests(db)
-    return manifests
+    return {"plugins": manifests, "total": len(manifests)}
 
 
 @router.get("/{name}/config")