Add LoraHelper Chat custom nodes

[frankluise5220]

Adds custom nodes for LLM-based image description, Danbooru-style tagging, and prompt enhancement using GGUF models (supports vision via mmproj).

Repository: https://github.com/frankluise5220/ComfyUI-lorahelper

Key nodes:

• UniversalGGUFLoader: Load GGUF models with auto chat format detection and optional vision support
• UniversalAIChat: Vision-capable chat with structured output (SECTION 1: description, SECTION 2: tags, SECTION 3: filename)
• LH_History_Monitor: Improved history display (multi-block UI, fixes long-line scrolling)

Dependencies: llama-cpp-python (users need to pip install manually)

Thanks for reviewing!

[frankluise5220]

"Closing this in favor of #2 as I've resolved the merge conflicts and corrected the repository link in the new PR. Thank you!"