Add notification status to users table in AP

backend/app/schemas/admin.py

@@ -27,6 +27,10 @@ class AdminUserResponse(BaseModel):
     banned_at: str | None = None
     banned_until: str | None = None  # None = permanent
     ban_reason: str | None = None
+    # Notification settings
+    notify_events: bool = True
+    notify_disputes: bool = True
+    notify_moderation: bool = True
 
     class Config:
         from_attributes = True