fix(update): 检查更新增加重试与镜像回退，错误提示本地化并缩短失败缓存 - #625
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- fetch_pypi_info 改为多源探测：pypi.org 重试 2 次，失败回退腾讯云/阿里云镜像 JSON API，透出 source 字段 - /update/status 与 /update/check 增加 error_code（pypi_unreachable）与 source 字段 - 失败探测的缓存 TTL 从 1 小时缩短为 5 分钟（后端内存缓存 + 前端 localStorage），网络恢复后自动重新探测 - 版本升级界面错误文案支持中英本地化（errors.pypi_unreachable），镜像来源显示提示 - octop update 失败提示补充网络/代理排查建议 - 新增 self_update 重试/回退与 update router 错误码/短 TTL 单测，前端缓存测试覆盖错误态 TTL
- PyPI 源表增加 per-source 超时：pypi.org 3s×2（SYN 被丢时快速失败）， 镜像 8s；「官方不通、镜像可用」从 ~16.5s 降到 ~6.5s，全源失败最坏 ~31s - fetch_pypi_info/fetch_latest_pypi_version 移除已无意义的 timeout 参数 - isUpdateStatusCacheExpired 改用与 readStoredUpdateStatus 相同的按状态 TTL（成功 1h / 失败 5min），不再固定 1h - UPDATE_STATUS_POLL_MS 改为 60s 廉价 tick（TTL gate 决定是否真正探测）， 失败态在错误 TTL 过后自动重探 - 升级页显示错误时挂 60s interval 自动 getUpdateStatus，红字随网络恢复 自动消失 - 测试：官方/镜像超时分级断言、前端失败自愈与 expiry 一致性用例
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Summary
Target branch
develop(feature / fix — default)main(release/*orhotfix/*only)Type of change
Test plan
make allpasses locallyChecklist
CHANGELOG.md(if user-facing)