feat(drive): remove create_home_folder

remove create_home_folder() & ensure_home_folder()

    now: on_user_created() and on_user_login both() call provision_if_needed()
    which calls **create_personal_drive_atomic()**

    add a helper to find Personal drive for a user and also it's root directorry

src/infrastructure/auth_factory.rs

@@ -47,7 +47,7 @@ pub async fn create_auth_services(
     );
 
     // Wire the user-lifecycle dispatcher. Home-folder provisioning is
-    // now handled by HomeFolderLifecycleHook (registered on the
+    // now handled by PersonalDriveLifecycleHook (registered on the
     // dispatcher in DI) — AuthApplicationService no longer needs a
     // direct FolderService dependency for that path.
     auth_app_service = auth_app_service.with_user_lifecycle(user_lifecycle);