Add LoRA adapter detection and base model extraction from HuggingFace tags

- Detect LoRA adapters from tags (lora, LoRA) and files (*.safetensors)
- Extract base model from tags (format: base_model:org/model-name)
- Skip model_index.json fetch for LoRA-only repos
- Determine pipeline class from base model for LoRA adapters
- Improves handling of models like enhanceaiteam/Flux-Uncensored-V2