add a config for custom OPENROUTER_API_URL

[bijiaoshenqi]

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[gemini-code-assist]

Summary of Changes

Hello @bijiaoshenqi, 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 enhances the application's configurability by enabling users to define a custom base URL for the OpenRouter API. This change moves away from a hardcoded URL, offering greater flexibility for deployments that might require a different OpenRouter endpoint. The update includes both the necessary code changes to utilize the new environment variable and comprehensive documentation to guide users on its setup.

Highlights

• Custom OpenRouter API URL: Introduces an optional OPENROUTER_API_URL environment variable, allowing users to specify a custom base URL for the OpenRouter API instead of the default.
• Configuration Documentation: The README.md has been updated to include instructions for setting the new OPENROUTER_API_URL in .env files across various setup methods (npm, Docker, npx, bunx) and to list it in the environment variable configuration section.
• Dynamic Base URL: The src/index.js file has been modified to dynamically use the OPENROUTER_API_URL environment variable for the OpenRouter API's baseURL, falling back to the default https://openrouter.ai/api/v1 if the variable is not set.

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[gemini-code-assist]

Code Review

This pull request adds a new configuration option, OPENROUTER_API_URL, to allow users to specify a custom API endpoint for OpenRouter. The implementation correctly uses an environment variable with a fallback to the default URL. The documentation in README.md has been updated to reflect this change. I have one minor suggestion to improve the consistency of the documentation.