feat(app): add manual entry and sharing flows

lib/core/constants/api_keys.dart

@@ -0,0 +1,47 @@
+import 'dart:convert';
+
+/// ApiKeys는 네이버 API 인증 정보를 환경 변수로 로드한다.
+///
+/// - `NAVER_CLIENT_ID`, `NAVER_CLIENT_SECRET`는 `flutter run`/`flutter test`
+///   실행 시 `--dart-define`으로 주입한다.
+/// - 민감 정보는 base64(난독화) 형태로 전달하고, 런타임에서 복호화한다.
+class ApiKeys {
+  static const String _encodedClientId = String.fromEnvironment(
+    'NAVER_CLIENT_ID',
+    defaultValue: '',
+  );
+  static const String _encodedClientSecret = String.fromEnvironment(
+    'NAVER_CLIENT_SECRET',
+    defaultValue: '',
+  );
+
+  static String get naverClientId => _decodeIfNeeded(_encodedClientId);
+  static String get naverClientSecret => _decodeIfNeeded(_encodedClientSecret);
+
+  static const String naverLocalSearchEndpoint =
+      'https://openapi.naver.com/v1/search/local.json';
+
+  static bool areKeysConfigured() {
+    return naverClientId.isNotEmpty && naverClientSecret.isNotEmpty;
+  }
+
+  /// 배포 스크립트에서 사용할 수 있는 편의 메서드.
+  static String obfuscate(String value) {
+    if (value.isEmpty) {
+      return '';
+    }
+    return base64.encode(utf8.encode(value));
+  }
+
+  static String _decodeIfNeeded(String value) {
+    if (value.isEmpty) {
+      return '';
+    }
+    try {
+      return utf8.decode(base64.decode(value));
+    } on FormatException {
+      // base64가 아니면 일반 문자열로 간주 (로컬 개발 편의용)
+      return value;
+    }
+  }
+}

lib/core/constants/app_colors.dart

@@ -12,8 +12,8 @@ class AppColors {
   static const lightError = Color(0xFFFF5252);
   static const lightText = Color(0xFF222222); // 추가
   static const lightCard = Colors.white; // 추가
-  
-  // Dark Theme Colors  
+
+  // Dark Theme Colors
   static const darkPrimary = Color(0xFF03C75A);
   static const darkSecondary = Color(0xFF00BF63);
   static const darkBackground = Color(0xFF121212);
@@ -24,4 +24,4 @@ class AppColors {
   static const darkError = Color(0xFFFF5252);
   static const darkText = Color(0xFFFFFFFF); // 추가
   static const darkCard = Color(0xFF1E1E1E); // 추가
-}
+}

lib/core/constants/app_constants.dart

@@ -3,33 +3,35 @@ class AppConstants {
   static const String appName = '오늘 뭐 먹Z?';
   static const String appDescription = '점심 메뉴 추천 앱';
   static const String appVersion = '1.0.0';
-  static const String appCopyright = '© 2025. NatureBridgeAI. All rights reserved.';
-  
+  static const String appCopyright =
+      '© 2025. NatureBridgeAI. All rights reserved.';
+
   // Animation Durations
   static const Duration splashAnimationDuration = Duration(seconds: 3);
   static const Duration defaultAnimationDuration = Duration(milliseconds: 300);
-  
+
   // API Keys (These should be moved to .env in production)
   static const String naverMapApiKey = 'YOUR_NAVER_MAP_API_KEY';
   static const String weatherApiKey = 'YOUR_WEATHER_API_KEY';
-  
+
   // AdMob IDs (Test IDs - Replace with real IDs in production)
   static const String androidAdAppId = 'ca-app-pub-3940256099942544~3347511713';
   static const String iosAdAppId = 'ca-app-pub-3940256099942544~1458002511';
-  static const String interstitialAdUnitId = 'ca-app-pub-3940256099942544/1033173712';
-  
+  static const String interstitialAdUnitId =
+      'ca-app-pub-3940256099942544/1033173712';
+
   // Hive Box Names
   static const String restaurantBox = 'restaurants';
   static const String visitRecordBox = 'visit_records';
   static const String recommendationBox = 'recommendations';
   static const String settingsBox = 'settings';
-  
+
   // Default Settings
   static const int defaultDaysToExclude = 7;
   static const int defaultNotificationMinutes = 90;
   static const int defaultMaxDistanceNormal = 1000; // meters
   static const int defaultMaxDistanceRainy = 500; // meters
-  
+
   // Categories
   static const List<String> foodCategories = [
     '한식',
@@ -41,4 +43,4 @@ class AppConstants {
     '패스트푸드',
     '기타',
   ];
-}
+}

lib/core/constants/app_typography.dart

@@ -7,28 +7,28 @@ class AppTypography {
     fontWeight: FontWeight.bold,
     color: isDark ? AppColors.darkTextPrimary : AppColors.lightTextPrimary,
   );
-  
+
   static TextStyle heading2(bool isDark) => TextStyle(
     fontSize: 20,
     fontWeight: FontWeight.w600,
     color: isDark ? AppColors.darkTextPrimary : AppColors.lightTextPrimary,
   );
-  
+
   static TextStyle body1(bool isDark) => TextStyle(
     fontSize: 16,
     fontWeight: FontWeight.normal,
     color: isDark ? AppColors.darkTextPrimary : AppColors.lightTextPrimary,
   );
-  
+
   static TextStyle body2(bool isDark) => TextStyle(
     fontSize: 14,
     fontWeight: FontWeight.normal,
     color: isDark ? AppColors.darkTextSecondary : AppColors.lightTextSecondary,
   );
-  
+
   static TextStyle caption(bool isDark) => TextStyle(
     fontSize: 12,
     fontWeight: FontWeight.normal,
     color: isDark ? AppColors.darkTextSecondary : AppColors.lightTextSecondary,
   );
-}
+}