Closes #11984, closes #11075. Release Notes: - Added the ability to customize available models for OpenAI-compatible services ([#11984](https://github.com/zed-industries/zed/issues/11984)) ([#11075](https://github.com/zed-industries/zed/issues/11075)). 
Closes #13399. Release Notes: - Fixed an issue where provider settings were lost when switching between Ollama models ([#13399](https://github.com/zed-industries/zed/issues/13399)).
Release Notes: - N/A