chore: remove unused profile lock migration and admin_profile_service

lib/utils/lock_enforcer.dart

@@ -0,0 +1,23 @@
+import 'package:supabase_flutter/supabase_flutter.dart';
+
+/// Call after sign-in and on app start to enforce app-level profile lock.
+/// If the user's `profiles.is_locked` flag is true, this signs out the user.
+Future<void> enforceLockForCurrentUser(SupabaseClient supabase) async {
+  final user = supabase.auth.currentUser;
+  if (user == null) return;
+
+  try {
+    final record = await supabase
+        .from('profiles')
+        .select('is_locked')
+        .eq('id', user.id)
+        .maybeSingle();
+
+    if (record == null) return;
+    if (record['is_locked'] == true) {
+      await supabase.auth.signOut();
+    }
+  } catch (_) {
+    // swallow; enforcement is a best-effort client-side check
+  }
+}