fix(db): remove the seeded test user from all environments

V1 inserted test@example.com / password123 everywhere, including prod. V5 deletes that row only when email and seed hash both match.

src/test/java/auth_service/modules/user/persistence/UserRepositoryTest.java

@@ -145,4 +145,10 @@ class UserRepositoryTest extends AbstractPersistenceTest {
 
         assertThrows(UserNotFoundException.class, () -> userRepository.updateSettings(-1L, null, settings));
     }
+
+    @Test
+    void migrations_LeaveNoSeededTestUser() {
+        // V1 seeded test@example.com with a known password; it must not exist after all migrations.
+        assertTrue(userRepository.findByEmail("test@example.com").isEmpty());
+    }
 }