Motivation:
1. Clarify node classification by moving from 'OpenAI' to 'LLM' category.
2. Improve default prompt/system_prompt for better UX.
3. Resolve ambiguity in configuration passthrough from LLMs Loader node.
Implementation:
1. Updated CATEGORY to 🚦ComfyUI_LLMs_Toolkit/LLM.
2. Changed default system_prompt to English and set default prompt to 'hello'.
3. Added 'LLM_CONFIG (from input)' option to provider and model dropdowns to explicitly handle external configuration.
4. Fixed a bug where unresolved 'model' parameter was sent to the API instead of 'actual_model'.