feat(drivers): Add a new storage driver for Tencent Cloud Object Storage (COS) using the official cos-go-sdk-v5 SDK

[521141]

Features:

• List objects with pagination via Bucket.Get
• Generate presigned download URLs via GetPresignedURL2
• Upload files with progress tracking and context cancellation
• Copy/Move/Rename objects with server-side copy
• Recursive directory operations (copy, delete)
• Direct upload support with presigned PUT URLs
• Custom domain support for download links
• Configurable presigned URL expiration

Summary / 摘要

This PR adds a new TencnetCOS storage driver that enables OpenList to manage files stored in Tencent Cloud Object Storage (COS). The driver
uses the official cos-go-sdk-v5 SDK for authentication and API operations, following the same patterns as the existing S3 driver.

Implementation details:

• driver.go: Implements driver.Driver and driver.Getter interfaces with full CRUD operations (List, Get, Put, Copy, Move, Rename,
  Remove, MakeDir, Link, DirectUpload)
• meta.go: Defines the Addition struct with required fields (Bucket, Region, SecretID, SecretKey) and optional fields (CustomHost,
  SignURLExpire, Placeholder, EnableDirectUpload)
• util.go: Helper functions for object listing with pagination, recursive copy/delete, and time parsing

No breaking changes, API changes, or storage format changes.

• This PR has breaking changes.
  / 此 PR 包含破坏性变更。
• This PR changes public API, config, storage format, or migration behavior.
  / 此 PR 修改了公开 API、配置、存储格式或迁移行为。
• This PR requires corresponding changes in related repositories.
  / 此 PR 需要关联仓库同步修改。

Related repository PRs / 关联仓库 PR:

• OpenList-Frontend: N/A
• OpenList-Docs: N/A

Related Issues / 关联 Issue

Relates to #376

Testing / 测试

• go test ./...
• Manual test / 手动测试:
  • Built the driver successfully with go build ./drivers/tencent_cos/
  • Verified driver registration via API (/api/admin/driver/list shows TencnetCOS with correct config fields)
  • Verified go vet ./drivers/tencent_cos/ passes with no warnings
  • Tested against running OpenList server instance

Checklist / 检查清单

• I have read CONTRIBUTING.
  / 我已阅读 CONTRIBUTING。
• I confirm this contribution follows the repository license, contribution policy, and code of conduct.
  / 我确认此贡献符合仓库许可证、贡献规范和行为准则。
• I have formatted the changed code with gofmt, go fmt, or prettier where applicable.
  / 我已按适用情况使用 gofmt、go fmt 或 prettier 格式化变更代码。
• I have requested review from relevant maintainers or code owners where applicable.
  / 我已在适用情况下请求相关维护者或代码所有者审查。

AI Disclosure / AI 使用声明

• This PR includes AI-assisted content.
  / 此 PR 包含 AI 辅助内容。

Tools used / 使用工具:

• ChatGPT
• Codex
• GitHub Copilot
• Claude
• Gemini
• Other (please specify) / 其他（请注明）:

Usage scope / 使用范围:

• Code generation / 代码生成

• Refactoring / 重构

• Documentation / 文档

• Tests / 测试

• Translation / 翻译

• Review assistance / 审查辅助

• I have reviewed and validated all AI-assisted content included in this PR.
  / 我已审核并验证此 PR 中的所有 AI 辅助内容。

• I have ensured that all AI-assisted commits include Co-Authored-By attribution.
  / 我已确保所有 AI 辅助提交都包含 Co-Authored-By 归属信息。

• I can reproduce all AI-assisted content included in this PR without any AI tools.
  / 我可以在没有任何 AI 工具的情况下重现此 PR 中包含的所有 AI 辅助内容。

[jyxjjj]

由于引入SDK行为对我们的方向规划具有一定特殊性，请提供引入前后的二进制产物大小对比数据，以便评估其对最终发布包体积的影响。

建议基于仓库 Fork 后通过 GitHub Actions 进行统一环境构建和对比测试，而非依赖本地编译结果，以避免因编译环境、Go 版本或构建参数差异导致的数据偏差。

[521141]

由于引入SDK行为对我们的方向规划具有一定特殊性，请提供引入前后的二进制产物大小对比数据，以便评估其对最终发布包体积的影响。

建议基于仓库 Fork 后通过 GitHub Actions 进行统一环境构建和对比测试，而非依赖本地编译结果，以避免因编译环境、Go 版本或构建参数差异导致的数据偏差。

因为要上课，我最近没有时间，要端午节我才有时间进行测试！