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/api/users.ts

@@ -12,6 +12,9 @@ export interface UserResponse {
   id: string;
   email: string;
   name: string;
+  first_name: string | null;
+  last_name: string | null;
+  avatar_url: string | null;
   role: string;
   role_id: string | null;
   is_active: boolean;
@@ -29,9 +32,15 @@ export interface UserCreate {
 
 export interface UserUpdate {
   name?: string;
+  first_name?: string;
+  last_name?: string;
+  email?: string;
+  avatar_url?: string | null;
   role?: string;
   role_id?: string | null;
   is_active?: boolean;
+  current_password?: string;
+  new_password?: string;
 }
 
 export function useUsers(page = 1, pageSize = 25) {