Restore admin shell and harden smoke tests

scripts/route_lint.mjs

@@ -27,6 +27,11 @@ const required = [
     file: 'tests/e2e/route-isolation.spec.ts',
     pattern: 'admin login boots the admin app under the admin base path',
     message: '관리자 base path 하네스가 필요합니다.'
+  },
+  {
+    file: 'tests/e2e/admin-smoke.spec.ts',
+    pattern: '.admin-shell',
+    message: '관리자 셸 렌더 검증이 필요합니다.'
   }
 ];
 
@@ -60,6 +65,13 @@ for (const file of adminFiles) {
       failed = true;
     }
   }
+
+  if (file === 'src/TaxBaik.Web.Client/Components/Admin/Layout/MainLayout.razor') {
+    if (!text.includes('<AdminShell>')) {
+      console.error('[route-lint] FAIL MainLayout: admin shell wrapper should be restored.');
+      failed = true;
+    }
+  }
 }
 
 if (failed) process.exit(1);