fix(app): 修复视频播放明文HTTP与双网络访问切换

lib/core/data/services/auth_session_store.dart

@@ -23,7 +23,7 @@ class AuthSessionStore {
 
   Future<String> deviceId() async {
     if (_cachedDeviceId != null) return _cachedDeviceId!;
-    final prefs = SharedPreferencesAsync();
+    final prefs = await SharedPreferences.getInstance();
     var value = await prefs.getString(_kDeviceId) ?? '';
     if (value.isEmpty) {
       final random = Random();
@@ -37,7 +37,7 @@ class AuthSessionStore {
   }
 
   Future<AuthSession?> read() async {
-    final prefs = SharedPreferencesAsync();
+    final prefs = await SharedPreferences.getInstance();
     final accessToken = await prefs.getString(_kAccessToken) ?? '';
     final refreshToken = await prefs.getString(_kRefreshToken) ?? '';
     if (accessToken.isEmpty || refreshToken.isEmpty) return null;
@@ -58,14 +58,14 @@ class AuthSessionStore {
   }
 
   Future<void> save(AuthSession session) async {
-    final prefs = SharedPreferencesAsync();
+    final prefs = await SharedPreferences.getInstance();
     await prefs.setString(_kAccessToken, session.accessToken);
     await prefs.setString(_kRefreshToken, session.refreshToken);
     await prefs.setString(_kUser, jsonEncode(session.user.toJson()));
   }
 
   Future<void> clear() async {
-    final prefs = SharedPreferencesAsync();
+    final prefs = await SharedPreferences.getInstance();
     await prefs.remove(_kAccessToken);
     await prefs.remove(_kRefreshToken);
     await prefs.remove(_kUser);