Flutter 앱 골격 · 5탭 네비게이션 · 로그인 화면 · Firestore 보안 규칙·인덱스

app/lib/features/station/station_screen.dart

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+import 'package:flutter/material.dart';
+
+import '../../core/ui/tab_placeholder.dart';
+
+/// STATION 탭 루트 — S-S-HUB STATION 허브.
+class StationScreen extends StatelessWidget {
+  const StationScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) => const TabPlaceholder(
+    tab: 'STATION',
+    screenId: 'S-S-HUB',
+    screenName: 'STATION 허브',
+    specPath: 'wireframe/planning/screen-spec/station/S-S-HUB.md',
+  );
+}