proxy时因为一个低级的拼写错误没有正确的携带请求头，导致代理模式时返回的数据不正确。但是现在用户发起的请求中的user-agent和x-forwarded等头部信息也没有正确的携带。虽然影响不大但还是想和跑批时更新的请求做一下区分。
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Bug Fixes**
- Enhanced error handling and logging for task execution, improving
traceability.
- **Improvements**
- Updated HTTP header access method for better alignment with context
structure.
- Clarified logic for manifest retrieval based on file type, ensuring
correct API usage.
- Streamlined cache handling and response generation logic in package
management.
- Improved method visibility and organization within the cache service
and controller.
- Simplified task creation logic and cache removal processes in the
controller.
- Updated expected outcomes for cache-related operations in the test
cases.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
closes https://github.com/cnpm/cnpmcore/issues/366
开启代理模式时如果找不到依赖会直接返回上游仓库的manifest信息并缓存于nfs，当请求的tgz文件不存在时从上游仓库获取并返回，同时创建对应版本的同步任务。每小时检查更新已缓存的manifest文件保证上游仓库发布新版本时不会因为缓存落后而404。
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Introduced proxy cache management for package manifests and versions.
- Added new HTTP methods for managing proxy caches.
- Implemented scheduled workers for updating and synchronizing proxy
cache.
- **Updates**
- Expanded `SyncMode` enum to include a new value `proxy`.
- Updated constants with `PROXY_CACHE_DIR_NAME` and
`ABBREVIATED_META_TYPE`.
- **Tests**
- Added comprehensive test cases for `ProxyCacheService`,
`ProxyCacheRepository`, and related controllers.
- Verified functionality of scheduled workers for proxy cache updates
and synchronization.
- Enhanced testing coverage for handling package downloads in proxy
mode.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: fengmk2 <suqian.yf@antgroup.com>
