Include proxy support

[luuquangvu]

• Add proxy support.
• For the README.zh.md file, I used GPT for translation. Please help review and make corrections.

Update:

• Fixes issues with tool results appearing in responses.
• Update GeminiClientPool to ensure it always returns a healthy client

[khaisilk1910]

Please update the fix. Thank you very much.

[luuquangvu]

After a few days of use and testing, it appears stable. The only issue is a low-level library bug, for which I have already submitted a PR.

[Copilot]

Pull Request Overview

This pull request adds proxy support for Gemini clients, fixes an issue where tool results were appearing in responses, and updates the GeminiClientPool to ensure it always returns healthy clients by implementing automatic restart logic.

• Adds optional per-client proxy configuration with validation
• Implements health checking and automatic client restart with lock-based coordination
• Introduces _strip_tagged_blocks() function to filter out tool result markers from responses
• Updates pool.acquire() to be async and handle RuntimeError exceptions appropriately

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
config/config.yaml	Adds optional proxy field to client configuration with documentation
app/utils/config.py	Implements proxy field validation to convert empty strings to None
app/services/pool.py	Converts acquire() to async, adds client health checking and restart logic with lock management
app/server/chat.py	Updates all pool.acquire() calls to await, adds _strip_tagged_blocks() to filter tool markers, adds RuntimeError exception handling
README.md	Documents proxy configuration with usage examples in Docker deployment sections
README.zh.md	Chinese translation of proxy documentation and README updates

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[Nativu5]

LGTM. I'll refine the Chinese docs in this branch and make sure the new proxy logic compatible with HTTP_PROXY variables before it is merged.

Thanks again for the contribution.

[Nativu5]

A quick heads-up: I was editing the docs but didn’t have permission to commit on this branch, so I moved the changes to a new branch instead.

@luuquangvu’s contribution is fully preserved there and properly credited with a Co-authored-by signature.

Sorry for the inconvenience!