feat(config): add developmentApi environment

- Added developmentApi enum
- For local Dart Frog API

Author: fulleni

lib/app/config/app_environment.dart

@@ -0,0 +1,6 @@
+enum AppEnvironment {
+  production,
+  developmentInMemory,
+  developmentApi, // New: For local Dart Frog API
+  // Add other environments like staging, etc. as needed
+}