Add OpenRouter endpoint with Bearer token authentication

[github-actions]

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I implemented the OpenRouter endpoint as requested in issue #615. The implementation follows the same pattern as other endpoints but includes the required 'Bearer' authentication token prefix as specified in the OpenRouter documentation. I added a new prompt_openrouter function that uses the OpenRouter API with a default model set to 'anthropic/claude-3-opus'. The function is now also available as a prompt handler through the 'openrouter' entry point in setup.cfg. A manual test was added to verify the endpoint's functionality.

• src/git_bob/_endpoints.py Added new prompt_openrouter function with Bearer token authentication and OpenRouter API integration.

• tests/test_endpoints.py Added manual test function for the OpenRouter endpoint.

• setup.cfg Added openrouter to the prompt handlers entry points.

closes #615

[r9r-dev]

Hello,
Would it be possible to merge this PR ? I made a fork while waiting 😛

[haesleinhuepf]

So you can confirm it's working @r9r-dev ?

[r9r-dev]

haha, good question ! It should work I guess... Can't confirm yet.
I'm not only using open router, my code is also on private gitlab instance. Using your code to make my own git-bob implementation directly into a gitlab repository and implementing not implemented methods.
Could take a while uu

[github-actions]

^{This message was generated by git-bob (version: 0.24.1, model: claude-3-5-sonnet-20241022, log), an experimental AI-based assistant. It can make mistakes and has limitations. Check its messages carefully.}

Hi @r9r-dev,

thanks for reaching out! Unfortunately, I'm not allowed to respond to you directly.
I need approval from a person who has access.

Best,
git-bob