fix(lastleg): register shipping mapper on startup

lastleg-service/src/main/java/com/baiyue/lastleg/shipping/ShippingMapperConfiguration.java

@@ -0,0 +1,10 @@
+package com.baiyue.lastleg.shipping;
+
+import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.context.annotation.Configuration;
+
+/** Registers the shipping gate persistence mapper used during event and receiving workflows. */
+@Configuration
+@MapperScan(basePackages = "com.baiyue.lastleg.shipping.mapper")
+public class ShippingMapperConfiguration {
+}