Motivation:
With 12 system providers, the provider dropdown menu in ComfyUI was too cluttered. Users only configure 1-2 providers on average.
Implementation:
1. Updated default_providers.json to disable most system providers out of the box (except Qwen and DeepSeek).
2. Filtered out disabled providers from INPUT_TYPES in openai_compatible.py.
3. Added equivalent filter to dynamic model dropdown logic in provider_manager.js.