Add Flutter app skeleton

app/lib/src/app.dart

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+import 'package:flutter/material.dart';
+
+import 'core/router/app_router.dart';
+
+class Tdc114PlusApp extends StatelessWidget {
+  const Tdc114PlusApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp.router(
+      title: 'tdc114plus',
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(seedColor: const Color(0xFF006D77)),
+        useMaterial3: true,
+      ),
+      routerConfig: appRouter,
+    );
+  }
+}

app/lib/src/core/config/app_environment.dart

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+class AppEnvironment {
+  const AppEnvironment({
+    required this.ssoBaseUrl,
+    required this.orgFrontBaseUrl,
+  });
+
+  factory AppEnvironment.fromDartDefine() {
+    return const AppEnvironment(
+      ssoBaseUrl: String.fromEnvironment(
+        'SSO_BASE_URL',
+        defaultValue: 'https://sso.example.invalid',
+      ),
+      orgFrontBaseUrl: String.fromEnvironment(
+        'ORGFRONT_BASE_URL',
+        defaultValue: 'https://orgfront.example.invalid',
+      ),
+    );
+  }
+
+  final String ssoBaseUrl;
+  final String orgFrontBaseUrl;
+}

app/lib/src/core/router/app_router.dart

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+import 'package:go_router/go_router.dart';
+
+import '../../features/auth/presentation/login_screen.dart';
+import '../../features/directory/presentation/directory_screen.dart';
+
+final appRouter = GoRouter(
+  initialLocation: LoginScreen.routePath,
+  routes: [
+    GoRoute(
+      path: LoginScreen.routePath,
+      builder: (context, state) => const LoginScreen(),
+    ),
+    GoRoute(
+      path: DirectoryScreen.routePath,
+      builder: (context, state) => const DirectoryScreen(),
+    ),
+  ],
+);

app/lib/src/features/auth/presentation/login_screen.dart

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+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+
+import '../../directory/presentation/directory_screen.dart';
+
+class LoginScreen extends StatefulWidget {
+  const LoginScreen({super.key});
+
+  static const routePath = '/login';
+
+  @override
+  State<LoginScreen> createState() => _LoginScreenState();
+}
+
+class _LoginScreenState extends State<LoginScreen> {
+  final _phoneController = TextEditingController();
+
+  @override
+  void dispose() {
+    _phoneController.dispose();
+    super.dispose();
+  }
+
+  void _submit() {
+    if (_phoneController.text.trim().isEmpty) {
+      return;
+    }
+    context.go(DirectoryScreen.routePath);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('tdc114plus')),
+      body: SafeArea(
+        child: ListView(
+          padding: const EdgeInsets.all(24),
+          children: [
+            const SizedBox(height: 32),
+            Text(
+              'Baron SSO 로그인',
+              style: Theme.of(context).textTheme.headlineSmall,
+            ),
+            const SizedBox(height: 8),
+            Text(
+              'Baron SSO에 등록된 전화번호를 입력하세요.',
+              style: Theme.of(context).textTheme.bodyMedium,
+            ),
+            const SizedBox(height: 24),
+            TextField(
+              controller: _phoneController,
+              keyboardType: TextInputType.phone,
+              textInputAction: TextInputAction.done,
+              decoration: const InputDecoration(
+                border: OutlineInputBorder(),
+                labelText: '전화번호',
+                prefixIcon: Icon(Icons.phone_android),
+              ),
+              onSubmitted: (_) => _submit(),
+            ),
+            const SizedBox(height: 16),
+            FilledButton.icon(
+              onPressed: _submit,
+              icon: const Icon(Icons.login),
+              label: const Text('로그인'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

app/lib/src/features/directory/presentation/directory_screen.dart

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+import 'package:flutter/material.dart';
+
+class DirectoryScreen extends StatelessWidget {
+  const DirectoryScreen({super.key});
+
+  static const routePath = '/directory';
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('직원검색')),
+      body: SafeArea(
+        child: ListView(
+          padding: const EdgeInsets.all(16),
+          children: const [
+            _SearchField(),
+            SizedBox(height: 16),
+            _FeatureTile(
+              icon: Icons.manage_search,
+              title: '직원검색',
+              subtitle: '이름, 부서, 직위로 직원을 검색합니다.',
+            ),
+            _FeatureTile(
+              icon: Icons.phone,
+              title: '전화번호검색',
+              subtitle: '전화번호로 직원을 검색합니다.',
+            ),
+            _FeatureTile(
+              icon: Icons.account_tree,
+              title: '조직도',
+              subtitle: '가족사와 부서 기준으로 직원을 탐색합니다.',
+            ),
+            _FeatureTile(
+              icon: Icons.star,
+              title: '즐겨찾기',
+              subtitle: '자주 연락하는 직원을 저장합니다.',
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _SearchField extends StatelessWidget {
+  const _SearchField();
+
+  @override
+  Widget build(BuildContext context) {
+    return const TextField(
+      decoration: InputDecoration(
+        border: OutlineInputBorder(),
+        hintText: '직원명 또는 전화번호 검색',
+        prefixIcon: Icon(Icons.search),
+      ),
+    );
+  }
+}
+
+class _FeatureTile extends StatelessWidget {
+  const _FeatureTile({
+    required this.icon,
+    required this.title,
+    required this.subtitle,
+  });
+
+  final IconData icon;
+  final String title;
+  final String subtitle;
+
+  @override
+  Widget build(BuildContext context) {
+    return Card(
+      child: ListTile(
+        leading: Icon(icon),
+        title: Text(title),
+        subtitle: Text(subtitle),
+      ),
+    );
+  }
+}