1. Add 登陆功能

2. 调整字体大小
3. 新增部分功能

backend/app/domain/auth/__init__.py

@@ -0,0 +1,10 @@
+"""Auth domain: role definitions and token claim models.
+
+The domain layer defines what a user identity looks like (UserClaims) and
+what roles exist (UserRole). Infrastructure details (JWT, bcrypt, PostgreSQL)
+live under infrastructure/auth and never leak into this package.
+"""
+
+from .models import UserClaims, UserRole
+
+__all__ = ["UserClaims", "UserRole"]