chore(config): 更新开发默认服务器地址

lib/core/config/app_config.dart

@@ -13,7 +13,7 @@ class AppConfig {
   ///
   /// 这个地址跟着电脑所在的网络走，换网络后要用
   /// `ipconfig getifaddr en0` 重新确认。默认值只改这一行。
-  static const String devHostBaseUrl = 'http://192.168.31.250:8081';
+  static const String devHostBaseUrl = 'http://172.18.0.7:8081';
 
   static const String _loopbackBaseUrl = 'http://127.0.0.1:8081';
 

test/config/server_endpoint_test.dart

@@ -57,13 +57,13 @@ void main() {
   });
 
   test('should_use_the_configured_lan_address_for_device_default', () {
-    expect(AppConfig.devHostBaseUrl, 'http://192.168.31.250:8081');
+    expect(AppConfig.devHostBaseUrl, 'http://172.18.0.7:8081');
   });
 
   test('should_apply_stored_url_only_when_debug_is_enabled', () async {
     SharedPreferencesAsyncPlatform.instance =
         InMemorySharedPreferencesAsync.withData({
-          ServerEndpoint.preferenceKey: ' http://192.168.31.250:8081/ ',
+          ServerEndpoint.preferenceKey: ' http://172.18.0.7:8081/ ',
         });
     final original = AppConfig.apiBaseUrl;
 
@@ -71,7 +71,7 @@ void main() {
     expect(AppConfig.apiBaseUrl, original);
 
     await ServerEndpoint.load(debug: true);
-    expect(AppConfig.apiBaseUrl, 'http://192.168.31.250:8081');
+    expect(AppConfig.apiBaseUrl, 'http://172.18.0.7:8081');
   });
 
   test('should_save_normalized_url_and_clear_override', () async {
@@ -81,10 +81,10 @@ void main() {
       isNull,
     );
 
-    expect(await ServerEndpoint.save(' http://192.168.31.250:8081/ '), isTrue);
+    expect(await ServerEndpoint.save(' http://172.18.0.7:8081/ '), isTrue);
     expect(
       await SharedPreferencesAsync().getString(ServerEndpoint.preferenceKey),
-      'http://192.168.31.250:8081',
+      'http://172.18.0.7:8081',
     );
 
     await ServerEndpoint.clear();