rename vision, add layour and tsr recognizer (#70)

api/apps/conversation_app.py

api/apps/llm_app.py

api/db/db_models.py

api/db/services/llm_service.py

deepdoc/parser/pdf_parser.py

deepdoc/vision/__init__.py

deepdoc/vision/layout_recognizer.py

deepdoc/vision/ocr.py

deepdoc/vision/ocr.res

deepdoc/vision/operators.py

deepdoc/vision/postprocess.py

deepdoc/vision/recognizer.py

deepdoc/vision/seeit.py

deepdoc/vision/table_structure_recognizer.py

deepdoc/visual/__init__.py

rag/svr/task_broker.py