docs: add stable-diffusion.cpp references

[rare-magma]

Summary by CodeRabbit

• Documentation
  • Added stable-diffusion.cpp as an additional local OpenAI-compatible server option in the feature list.
  • Updated Docker installation guidance to mention the stable-diffusion.cpp server alongside existing options for nightly images.
  • Noted that the stable-diffusion.cpp server is included for the musa and vulkan platforms.

[coderabbitai]

Walkthrough

The PR updates README.md to list stable-diffusion.cpp as an additional local OpenAI-compatible server option and adds it to the Docker nightly images instructions (noting inclusion for musa and vulkan platforms).

Changes

Cohort / File(s)	Summary
Documentation Updates README.md	Added stable-diffusion.cpp to the feature list and Docker installation instructions for nightly images; noted the server is included for the musa and vulkan platforms.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding references to stable-diffusion.cpp in documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

Warning

Review ran into problems

🔥 Problems

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