feat: add PostgreSQL web installation wizard

oa-backend/src/main/java/com/kaidi/oa/seed/FertPkgAccountingSeeder.java

@@ -10,7 +10,6 @@ import com.kaidi.oa.repository.FertPkgMaterialLedgerRepository;
 import org.springframework.boot.ApplicationArguments;
 import org.springframework.boot.ApplicationRunner;
 import org.springframework.core.annotation.Order;
-import org.springframework.stereotype.Component;
 import org.springframework.transaction.annotation.Transactional;
 
 import java.math.BigDecimal;
@@ -27,7 +26,7 @@ import java.time.Instant;
  * 幂等：按唯一编码查重后跳过，重启不重复插入。
  * Order(201) 保证在 DataSeeder(200) 之后执行。
  */
-@Component
+@DemoSeed
 @Order(201)
 public class FertPkgAccountingSeeder implements ApplicationRunner {