fix：第一轮跑

lib/common/services/cache_clear_service.dart

@@ -0,0 +1,38 @@
+import 'dart:io' show Platform;
+
+import 'package:android_intent_plus/android_intent.dart';
+import 'package:flutter_cache_manager/flutter_cache_manager.dart';
+import 'package:flutter/foundation.dart' show kIsWeb;
+import 'package:package_info_plus/package_info_plus.dart';
+
+import '../storage/storage_service.dart';
+
+/// Clears only disposable presentation data. Credentials and user preferences
+/// deliberately remain outside this service.
+class CacheClearService {
+  const CacheClearService._();
+
+  static Future<void> clear() async {
+    await DefaultCacheManager().emptyCache();
+    await SplashAdControllerPlaceholder.clear();
+  }
+
+  static bool get requiresSystemSettings => !kIsWeb && Platform.isAndroid;
+
+  static Future<void> openAndroidSystemSettings() async {
+    final packageName = (await PackageInfo.fromPlatform()).packageName;
+    await AndroidIntent(
+      action: 'android.settings.APPLICATION_DETAILS_SETTINGS',
+      data: 'package:$packageName',
+    ).launch();
+  }
+}
+
+/// CacheClearService is used outside Riverpod; the splash entry itself lives
+/// in SharedPreferences and is removed here without touching user data.
+abstract final class SplashAdControllerPlaceholder {
+  static Future<void> clear() async {
+    await StorageService.to.preferences.remove('ads.splash.entry');
+    await StorageService.to.preferences.remove('ads.splash.daily');
+  }
+}