[Bug]: WebDav同步支持302重定向

### Prerequisites|前提条件

- [x] I have checked the [troubleshooting](https://github.com/Anxcye/anx-reader/blob/develop/docs/troubleshooting.md)|我已经查看过[故障排除](https://github.com/Anxcye/anx-reader/blob/develop/docs/troubleshooting.md)
- [x] I have searched for similar issues and did not find any|我已经搜索过没有相同的问题

### Describe the bug|描述问题

SEVERE^*^ 2025-05-29 14:43:03.391844^*^ [Sync failed DioException [bad response]: null Error: Method Not Allowed],#0 AnxLog.severe (package:anx_reader/utils/log/common.dart:85) #1 AnxWebdav.syncData (package:anx_reader/providers/anx_webdav.dart:272)

### To reproduce|重现步骤

同步成功一下就提示

### Expected behavior|预期行为

正常连续同步

### Screenshots|截图

### Platform (please complete the following information)|平台（请填写以下信息）

- Platform: | 平台：
mac
- OS: | 操作系统：
13.7.6
- AnxReader Version: | 安读版本：
1.5.3+2124
- Device: | 设备：
mac intel

### Additional context|其他信息

_No response_