fix：对比原型增加功能交互

lib/data/repositories/outbound_repository.dart

@@ -0,0 +1,16 @@
+import '../state/app_interaction_state.dart';
+
+abstract class OutboundRepository {
+  Future<void> recordOutbound(OutboundEvent event);
+}
+
+class MemoryOutboundRepository implements OutboundRepository {
+  final List<OutboundEvent> _events = [];
+
+  List<OutboundEvent> get events => List.unmodifiable(_events);
+
+  @override
+  Future<void> recordOutbound(OutboundEvent event) async {
+    _events.add(event);
+  }
+}