build dialog server; add thumbnail to docinfo; (#17)

Cargo.toml

migration/src/m20220101_000001_create_table.rs

python/conf/sys.cnf

python/llm/chat_model.py

python/nlp/search.py

python/svr/dialog_svr.py

python/svr/parse_user_docs.py

src/api/doc_info.rs

src/api/user_info.rs

src/entity/doc_info.rs

src/entity/tag2_doc.rs

src/service/doc_info.rs