feat(sandbox): 配置创建和连接重试

[DROWNING2003]

变更

• 升级 github.com/qiniu/go-sdk/v7 至 v7.27.0，使用创建请求幂等键与可重试调用支持。
• 为 qshell sandbox create 和 qshell sandbox connect 增加 --retry-max，0 禁用重试；未指定时保留 SANDBOX_RETRY_MAX 和 SDK 默认 5 次重试的行为。
• 补充命令文档、CHANGELOG 和客户端配置测试。

验证

• make test
• gofmt -s -l .
• staticcheck ./iqshell/sandbox/... ./cmd/...

全量 make lint 仍受仓库既有、与本 PR 无关的 staticcheck 告警影响。

[qiniu-prow]

Hi @DROWNING2003. Thanks for your PR.

I'm waiting for a qiniu member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[fennoai]

No issues found in this review. Focused review covered code quality, performance, security, and documentation accuracy. Verification: go test ./cmd ./iqshell/sandbox/... passed.

[miclle]

LGTM

[qiniu-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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This pull-request has been approved by: DROWNING2003

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