Relax admin email schema validation

backend/app/schemas/core.py

@@ -1,6 +1,6 @@
 from datetime import datetime
 
-from pydantic import BaseModel, ConfigDict, EmailStr
+from pydantic import BaseModel, ConfigDict
 
 
 class LoginIn(BaseModel):
@@ -14,7 +14,7 @@ class TokenOut(BaseModel):
 
 
 class UserBase(BaseModel):
-    email: EmailStr
+    email: str
     username: str
     nickname: str = ""
     status: str = "enabled"
@@ -26,7 +26,7 @@ class UserCreate(UserBase):
 
 
 class UserUpdate(BaseModel):
-    email: EmailStr | None = None
+    email: str | None = None
     username: str | None = None
     nickname: str | None = None
     status: str | None = None