rebrand: rename processor classes to BrainOCR

remove auto_map (handled by vLLM plugin)

remove custom config (handled by vLLM plugin)

fix: restore processor class names for vLLM compatibility

fix: standalone config class without hunyuan_vl dependency

add auto_map for custom config class

add custom config for brain_ocr model_type

Initial release: BrainOCR with embedding optimization

initial commit