feat：参照研听的基础工程

lib/common/storage/storage_keys.dart

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+const storageThemeMode = 'theme_mode';
+const storagePrivacyAgreed = 'privacy_agreed'; // Android 首启隐私同意（设备采集门控）
+const storageIosStartupSeen = 'ios_startup_seen'; // iOS 首次启动页已展示
+const storageJinzhiHoldings = 'jinzhi_holdings';
+const storageJinzhiAmountHidden = 'jinzhi_amount_hidden';
+const storageJinzhiRecycleDiscounts = 'jinzhi_recycle_discounts';
+const storageJinzhiPurityPresets = 'jinzhi_purity_presets';
+const storageJinzhiPriceColorMode = 'jinzhi_price_color_mode';
+const storageJinzhiMockLoggedIn = 'jinzhi_mock_logged_in';
+
+// 设备/广告标识。由各自的 SDK/ATT 流程写入，DeviceHeaderService 读出注入
+// header；未写入则为空、注入时被过滤。
+const storageDeviceToken = 'device_token'; // 推送 token
+const storageAndroidId = 'android_id';
+const storageAndroidOaid = 'android_oaid';
+const storageAndroidImei = 'android_imei';
+const storageAndroidMac = 'android_mac';
+const storageIosIdfa = 'ios_idfa';
+const storageIosPaid = 'ios_paid';

lib/common/storage/storage_service.dart

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+import 'package:shared_preferences/shared_preferences.dart';
+
+class StorageService {
+  StorageService._(this._prefs);
+  final SharedPreferences _prefs;
+  static StorageService? _instance;
+  static StorageService get to => _instance!;
+
+  static Future<StorageService> get instance async {
+    if (_instance != null) return _instance!;
+    final prefs = await SharedPreferences.getInstance();
+    _instance = StorageService._(prefs);
+    return _instance!;
+  }
+
+  bool getBool(String key, {bool def = false}) => _prefs.getBool(key) ?? def;
+  Future<void> setBool(String key, bool v) => _prefs.setBool(key, v);
+  String? getString(String key) => _prefs.getString(key);
+  Future<void> setString(String key, String v) => _prefs.setString(key, v);
+}