Update to Qwen2.5-Coder-32B-Instruct and add keep-alive loop for persistent Space

Update model to Qwen2.5-Coder-32B-Instruct

Update model to Qwen2.5-7B-Instruct and add explicit tool schemas to system prompt

Update default model to Qwen2.5-Coder-32B-Instruct

fix: switch to HF's new router.huggingface.co endpoint (deprecated api-inference)

fix: switch from deprecated HF API to Together AI API (free tier)

fix: improve HF_TOKEN error handling - print setup instructions once instead of every step