llm-gemini plugin updated with support for Gemini 3.7 Flash

After a significant hiatus, a new version of the llm-gemini plugin has been released with support for today's Gemini 3.7 Flash model, along with Gemini 3.6 Flash, Gemini 3.5 Flash Lite, and two embedding models. The plugin was also updated for compatibility with LLM 0.32, allowing users to view reasoning traces and enable server-side tools. Compared to the previous version, version 3.7 removed the "minimal" mode option that existed in 3.6.