fix: show role for each team member in seed summary

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/seed/seed_demo.py

@@ -1397,6 +1397,7 @@ def print_summary(db: Session):
         print(f"  {member_data['first_name']} {member_data['last_name']} ({merchant_name})")
         print(f"    Email:    {member_data['email']}")
         print(f"    Password: {member_data['password']}")  # noqa: SEC021
+        print(f"    Role:     {member_data['role']}")
         print(f"    Stores:   {store_codes}")
         print()