fix(auth): respect configured auto-refresh interval

[lyd123qw2008]

Description

• 修复 StartAutoRefresh 将传入 interval 强制覆盖为 refreshCheckInterval 的问题。
• 变更后仅在 interval <= 0 时回退到默认 refreshCheckInterval，否则使用调用方传入值（例如 15m）。

Why

• 当前实现导致 auto-refresh 实际固定 5 秒检查一次。
• 在大量 auth 文件场景下，会放大 refresh 调度频率和系统负载。

Scope

• 单文件、单逻辑点修改：
  • sdk/cliproxy/auth/conductor.go

Diff summary

• Before:
  • 无论传入什么间隔，都变成 5 秒。
• After:
  • 仅当传入值无效时使用 5 秒默认值；有效值保留。

Verification

1. 容器构建通过
   • docker compose build cli-proxy-api
2. 定向测试通过
   • go test ./sdk/cliproxy/auth（容器内）
3. 全量测试现状
   • go test ./... 失败点在已有 thinking e2e 用例，与本 PR 无关。

Risk

• 低风险，未改刷新判定、重试、并发逻辑，仅修复 interval 赋值错误。

[gemini-code-assist]

Summary of Changes

Hello @lyd123qw2008, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在优化认证模块中的自动刷新机制。通过修正一个逻辑错误，确保了用户自定义的刷新间隔能够被正确采纳，而非总是被固定为默认值。这一改进避免了在大量认证文件场景下可能出现的过度刷新调度和系统负载增加，从而提升了系统的稳定性和效率。

Highlights

• 修复自动刷新间隔: 解决了 StartAutoRefresh 函数中，传入的自动刷新间隔 interval 被强制覆盖为默认值 refreshCheckInterval 的问题。现在，只有当传入的 interval 小于等于0时，才会回退到默认值，否则将使用调用方指定的值。

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Changelog

• sdk/cliproxy/auth/conductor.go
  • 修正了 StartAutoRefresh 函数中自动刷新间隔的设置逻辑。

Activity

• 此拉取请求自创建以来，尚未有任何人工活动（例如评论或审查）。

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[gemini-code-assist]

Code Review

这个 PR 修复了 StartAutoRefresh 函数中自动刷新间隔被强制覆盖为默认值的问题。之前的代码逻辑有误，无论传入的 interval 是多少，都会被设置为 refreshCheckInterval (5秒)。修改后的代码只在 interval 小于等于0时才使用默认值，否则会采用调用方传入的有效间隔。这个修复是正确的，解决了高负载下因刷新过于频繁导致的问题，并且代码简洁明了。