fix(flutter): 修复 iOS 启动网络加载

test/config/server_endpoint_test.dart

@@ -60,6 +60,59 @@ void main() {
     expect(AppConfig.devHostBaseUrl, 'http://192.168.31.187:8081');
   });
 
+  test('should_keep_loopback_priority_when_probe_succeeds', () async {
+    final attempts = <String>[];
+
+    await AppConfig.probeAndApplyBaseUrl(
+      fallbackBaseUrl: AppConfig.devHostBaseUrl,
+      probe: (baseUrl) async {
+        attempts.add(baseUrl);
+        return baseUrl == AppConfig.lanBaseUrl;
+      },
+    );
+
+    expect(attempts, [AppConfig.lanBaseUrl]);
+    expect(AppConfig.apiBaseUrl, AppConfig.lanBaseUrl);
+  });
+
+  test('should_probe_loopback_dev_host_then_public_in_order', () async {
+    final attempts = <String>[];
+
+    await AppConfig.probeAndApplyBaseUrl(
+      fallbackBaseUrl: AppConfig.devHostBaseUrl,
+      probe: (baseUrl) async {
+        attempts.add(baseUrl);
+        return baseUrl == AppConfig.publicBaseUrl;
+      },
+    );
+
+    expect(attempts, [
+      AppConfig.lanBaseUrl,
+      AppConfig.devHostBaseUrl,
+      AppConfig.publicBaseUrl,
+    ]);
+    expect(AppConfig.apiBaseUrl, AppConfig.publicBaseUrl);
+  });
+
+  test('should_use_platform_default_when_all_probes_fail', () async {
+    final attempts = <String>[];
+
+    await AppConfig.probeAndApplyBaseUrl(
+      fallbackBaseUrl: AppConfig.devHostBaseUrl,
+      probe: (baseUrl) async {
+        attempts.add(baseUrl);
+        return false;
+      },
+    );
+
+    expect(attempts, [
+      AppConfig.lanBaseUrl,
+      AppConfig.devHostBaseUrl,
+      AppConfig.publicBaseUrl,
+    ]);
+    expect(AppConfig.apiBaseUrl, AppConfig.devHostBaseUrl);
+  });
+
   test('should_apply_stored_url_only_when_debug_is_enabled', () async {
     SharedPreferencesAsyncPlatform.instance =
         InMemorySharedPreferencesAsync.withData({
@@ -81,10 +134,7 @@ void main() {
       isNull,
     );
 
-    expect(
-      await ServerEndpoint.save(' http://192.168.31.187:8081/ '),
-      isTrue,
-    );
+    expect(await ServerEndpoint.save(' http://192.168.31.187:8081/ '), isTrue);
     expect(
       await SharedPreferencesAsync().getString(ServerEndpoint.preferenceKey),
       'http://192.168.31.187:8081',