Feat/gemini baseurl

[KynuxDev]

Add Gemini base URL support for code indexing
This PR adds support for custom Gemini API base URLs in the code indexing feature.

What changed:

Added baseUrl configuration option for Gemini embeddings
Users can now use custom Gemini API endpoints instead of just the default one
Backward compatible - existing configs continue to work
Why needed:
I noticed the Gemini code indexing didn't support custom base URLs, which some users need for regional endpoints or proxy configurations.

Usage:
Users can now configure their preferred Gemini API endpoint in the code indexing settings.

[changeset-bot]

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Latest commit: 66fc66c

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