Add use_for_verification field to CloudflareAccount model

backend/app/models.py

@@ -101,6 +101,7 @@ class CloudflareAccount(db.Model):
     current_domains = db.Column(db.Integer, default=0)
     notes = db.Column(db.Text)
     is_active = db.Column(db.Boolean, default=True)
+    use_for_verification = db.Column(db.Boolean, default=True)  # Use for customer domain verification
     created_at = db.Column(db.DateTime, default=datetime.utcnow)
     updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
     
@@ -113,6 +114,7 @@ class CloudflareAccount(db.Model):
             'current_domains': self.current_domains,
             'notes': self.notes,
             'is_active': self.is_active,
+            'use_for_verification': self.use_for_verification,
             'created_at': self.created_at.isoformat() if self.created_at else None,
             'updated_at': self.updated_at.isoformat() if self.updated_at else None,
         }