If <image_path> is omitted, reads image from clipboard using
wl-paste (Wayland) or xclip (X11), then passes the raw data to
mtmd_helper_bitmap_init_from_buf for decoding.
- Support GLM-OCR model with -m (model) and --mmproj (mmproj) options
- Custom prompt support via -p (default: OCR)
- Greedy/temperature sampling with --temp flag
- JSON output with --json flag
- GPU acceleration via -ngl option
- Use correct GLM-OCR chat template format for prompt construction