feat: support tencent cos custom domain

[fatelei]

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Summary

fix #29001

support tencent cos custom domain

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @fatelei, 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!

This pull request introduces a significant enhancement to the Tencent Cloud Object Storage (COS) integration by enabling the use of custom domains. This change provides greater flexibility and control over how COS resources are accessed, allowing for more tailored and potentially optimized storage solutions within the application. It ensures that the system can adapt to various deployment scenarios where custom domain mapping for cloud storage is a requirement.

Highlights

• Tencent COS Custom Domain Support: Introduced a new configuration option, TENCENT_COS_CUSTOM_DOMAIN, to allow users to specify a custom domain for Tencent Cloud Object Storage.
• Flexible COS Configuration: The TencentCosStorage class now dynamically configures the COS client, prioritizing the custom domain if provided, and falling back to the traditional region-based setup otherwise.
• Enhanced Test Coverage: New unit tests have been added to thoroughly validate the TencentCosStorage initialization logic for both custom domain and region-based configurations.
• Environment Variable Update: The .env.example file has been updated to include the new TENCENT_COS_CUSTOM_DOMAIN variable, guiding users on how to configure this feature.

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[gemini-code-assist]

Code Review

This pull request adds support for using a custom domain with Tencent Cloud COS, which is a great feature enhancement. The implementation is straightforward and includes corresponding configuration updates and new unit tests to verify the logic for both custom domain and region-based setups. I've suggested a small refactoring to reduce code duplication in the TencentCosStorage initialization, which will improve maintainability. Overall, this is a solid contribution.