feat: MeshCore SAR - Flutter BLE mesh radio companion app

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/utils/debug_print.dart

@@ -0,0 +1,8 @@
+import 'package:flutter/foundation.dart';
+
+/// Debug print that only outputs in debug builds
+void debugPrint(Object? message) {
+  if (kDebugMode) {
+    debugPrint(message);
+  }
+}