init cc

lib/core/constants/app_constants.dart

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+/// Application-wide constants
+class AppConstants {
+  // App Information
+  static const String appName = 'Base Flutter';
+  static const String appVersion = '1.0.0';
+
+  // API Configuration
+  static const Duration connectionTimeout = Duration(seconds: 30);
+  static const Duration receiveTimeout = Duration(seconds: 30);
+  static const Duration sendTimeout = Duration(seconds: 30);
+
+  // Pagination
+  static const int defaultPageSize = 20;
+  static const int maxPageSize = 100;
+
+  // Cache Configuration
+  static const Duration cacheExpiration = Duration(hours: 1);
+  static const int maxCacheSize = 50 * 1024 * 1024; // 50MB
+
+  // Animation Durations
+  static const Duration shortAnimation = Duration(milliseconds: 200);
+  static const Duration mediumAnimation = Duration(milliseconds: 300);
+  static const Duration longAnimation = Duration(milliseconds: 500);
+
+  // UI Constants
+  static const double defaultPadding = 16.0;
+  static const double smallPadding = 8.0;
+  static const double largePadding = 24.0;
+  static const double defaultRadius = 8.0;
+
+  // Error Messages
+  static const String networkErrorMessage = 'Network connection error';
+  static const String unknownErrorMessage = 'An unknown error occurred';
+  static const String timeoutErrorMessage = 'Request timeout';
+}