chore(ovhcloud): remove 3 models no longer available in AI Endpoints

- deepseek-r1-distill-llama-70b
- mixtral-8x7b-instruct-v0.1
- qwen2.5-coder-32b-instruct

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sopial42