support snapshot download from local (#153)

README.md

api/apps/conversation_app.py

deepdoc/parser/pdf_parser.py

deepdoc/vision/layout_recognizer.py

deepdoc/vision/ocr.py

deepdoc/vision/recognizer.py

deepdoc/vision/table_structure_recognizer.py

docker/README.md

docker/entrypoint.sh

docker/service_conf.yaml

rag/llm/embedding_model.py

rag/svr/task_executor.py