- Add 'none' to --offload-strategy choices in cli.py
- In cuda.py backend:
  - _get_vram_percentages_for_strategy() returns None for 'none' strategy
  - _get_vram_percentages_for_gpu() skips VRAM detection for 'none'
  - load_model() loads directly on GPU without max_memory constraints
- Add startup status message in main.py for --offload-strategy none