Fix: remove unsupported SFTConfig params

Fix: USER env for torch cache, remove duplicate import

Fix: use SFTConfig for newer TRL API

Fix: remove deprecated dataset_text_field for newer TRL

Fix: tokenizer -> processing_class for newer TRL

Fix: set USER env var for PyTorch cache in container

Fix: total_mem -> total_memory in training script

Add optional LoRA training on startup (RUN_LORA_TRAINING flag)