feat(llm): support log_block in RAG platform & rest-api

[diya-he]

curl command for rolling logs in cmd:

curl -X POST "http://127.0.0.1:8001/logs" -H "Content-Type: application/json" \
-H "Authorization: Bearer 123456" \
-d "{\"log_token\": \"000000\", \"log_file\": \"llm-server.log\"}"

[imbajin]

merge it after #111 (need update the code)

[imbajin]

lines = file.readlines()[-num_lines:] (maybe?)

[imbajin]

Thanks for your contribution