refactor(auth): remove GET /users/me endpoint and related exports

src/features/auth/index.js

@@ -1,6 +1,5 @@
 /**
  * Zen Authentication — server barrel.
- * Client components live in @zen/core/features/auth/components.
  * Server actions live in @zen/core/features/auth/actions.
  */
 
@@ -39,8 +38,6 @@ export {
   generateId
 } from './password.js';
 
-export { protect, checkAuth, requireRole } from './protect.js';
-
 export {
   registerAction,
   loginAction,