[Enhance] [Refactor] Add API about characters

- Add API endpoints about characters
- Some small changes in refactoring

latest version/server/world.py

@@ -1,7 +1,8 @@
+from flask import Blueprint, request
+
 from core.sql import Connect
 from core.user import UserOnline
 from core.world import UserMap, get_world_all
-from flask import Blueprint, request
 
 from .auth import auth_required
 from .func import arc_try, success_return