API Testing playground implemented

Refactored css styles to separate folders and minor fixes

Frontend debug page

fixed some bug in processing logic

FIRST VERSION with real agent!!

fixed the preference renew; and shorten the prompt to save tokens

[major updates] add user profile and add LLM responds

changed map ui

update back and front end

Useful settings for huggingface space deployment

jn's part - a base of front&back-end, complete the basic interaction requirements