Feat：admin api (#10642)

### What problem does this PR solve?

Support frontend auth.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/common/exceptions.py

@@ -36,3 +36,8 @@ class UserAlreadyExistsError(AdminException):
 class CannotDeleteAdminError(AdminException):
     def __init__(self):
         super().__init__("Cannot delete admin account", 403)
+
+
+class NotAdminError(AdminException):
+    def __init__(self, username):
+        super().__init__(f"User '{username}' is not admin", 403)