feat(training): add evaluation with label masking and padding collator

chore: add .qoder/ to .gitignore

feat(device-config): add automatic device detection for medical LoRA training

add qwen_domain_expansion

update notebook

docs(readme): add Getting Started section with setup instructions

docs: add LICENSE, README, and author/license headers to all source files

feat(notebooks): add LoRA explanation tutorials for BERT and Qwen

docs(train_lora): update comment to generic GPU reference

Initial commit: QLoRA fine-tuning code + trained LoRA adapters