Initial Flutter scaffold: Riverpod + GoRouter + Dio

lib/config/env.dart

@@ -0,0 +1,8 @@
+class Env {
+  static const String apiBaseUrl = String.fromEnvironment(
+    'API_BASE_URL',
+    defaultValue: 'http://localhost:3000',
+  );
+  
+  // Add more environment variables as needed
+}