2 API song song: /v4/ocr (cũ) + /v11/ocr (mới acc 0.225), /ocr=v11

Add root landing page

New fine-tuned det+rec, ViLM postprocess v2, no_enhance default, LLM post-edit module

Delete fix_register_beam.py, patch_beam_search.py, usage_examples.py; remove module docstrings, section banners, and inline explanatory comments from all source files

Fix model download path

Fix HF model repo ID and add token support

Add Dockerfile and HF Spaces config

Add FastAPI OCR endpoint