proxy: support /v1/images/generations

[mostlygeek]

Add support for the /v1/images/generations endpoint

Updates #433
Closes #191

Summary by CodeRabbit

• New Features

  • Image generation endpoint now available to use with local OpenAI-compatible servers, featuring API key authentication and seamless integration with existing generation workflows.

• Documentation

  • Documentation expanded to include the new image generation endpoint and configuration details for local server setups.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

This pull request adds support for the /v1/images/generations endpoint by introducing a new API route in the proxy manager and documenting it in the README. The endpoint reuses existing image generation handler infrastructure.

Changes

Cohort / File(s)	Summary
Documentation README.md	Added bullet point for v1/images/generations under the "Use any local OpenAI compatible server" section
API Route Addition proxy/proxymanager.go	Registered new POST /v1/images/generations endpoint with API key authentication, routed through existing proxyInferenceHandler

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

✨ Finishing touches

• 📝 Generate docstrings

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📜 Recent review details

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 22e098a and d2b0331.

📒 Files selected for processing (2)

• README.md
• proxy/proxymanager.go

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