feat:增加消息记录功能

lib/services/dio_service.dart

@@ -1,7 +1,8 @@
 import 'package:dio/dio.dart';
+import 'package:sweet_chat_app/config/AppConfig.dart';
 
 final dioService = Dio(BaseOptions(
-  baseUrl: 'http://172.29.100.146:2836/api',
-  connectTimeout: Duration(seconds: 10),
+  baseUrl: AppConfig.baseUrl,
+  connectTimeout: Duration(seconds: 5),
   headers: {'Content-Type': 'application/json'},
 ));

lib/services/message_store.dart

@@ -0,0 +1,13 @@
+import 'package:sweet_chat_app/models/im_message.dart';
+
+class MessageStore {
+  static final Map<String, List<ImMessage>> _data = {};
+
+  static void add(ImMessage msg) {
+    _data.putIfAbsent(msg.to, () => []).add(msg);
+    _data.putIfAbsent(msg.from, () => []).add(msg);
+  }
+
+  static List<ImMessage> messagesFor(String userId) =>
+      _data[userId] ?? [];
+}