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

frontend/src/components/ai/SuggestionBadge.tsx

@@ -11,7 +11,7 @@ export function SuggestionBadge({ onClick }: SuggestionBadgeProps) {
 
   useEffect(() => {
     // Initial count
-    apiClient.get('/api/v1/ai-proactive/suggestions').then(r => {
+    apiClient.get('/ai-proactive/suggestions').then(r => {
       setCount(r.data.items.length);
     }).catch(() => {});