feat(ios): 首次启动询问无线数据权限

iOS 在首个接口请求前等待系统无线数据选择，避免未授权时请求被静默拒绝。

test/platform/wireless_data_prompt_test.dart

@@ -0,0 +1,54 @@
+// Author: fruit.com.cn
+
+import 'dart:async';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/core/platform/wireless_data_prompt.dart';
+
+void main() {
+  setUp(WirelessDataPrompt.resetForTest);
+  tearDown(WirelessDataPrompt.resetForTest);
+
+  test('should_return_immediately_when_disabled', () async {
+    var calls = 0;
+
+    await WirelessDataPrompt.awaitDecision(
+      enabled: false,
+      ask: () async {
+        calls++;
+      },
+    );
+
+    expect(calls, 0);
+  });
+
+  test('should_ask_once_when_enabled', () async {
+    var calls = 0;
+
+    Future<void> ask() async {
+      calls++;
+    }
+
+    await WirelessDataPrompt.awaitDecision(enabled: true, ask: ask);
+    await WirelessDataPrompt.awaitDecision(enabled: true, ask: ask);
+
+    expect(calls, 1);
+  });
+
+  test('should_continue_when_decision_times_out', () async {
+    await WirelessDataPrompt.awaitDecision(
+      enabled: true,
+      ask: () => Completer<void>().future,
+      timeout: const Duration(milliseconds: 20),
+    );
+  });
+
+  test('should_continue_when_ask_fails', () async {
+    await WirelessDataPrompt.awaitDecision(
+      enabled: true,
+      ask: () async {
+        throw StateError('channel missing');
+      },
+    );
+  });
+}