refactor: 重构WebSocket服务及相关实体类

重构WebSocket服务名称从WebSocketService改为WebSocketClientService，并实现Serializable接口
添加WebSocket常量定义和消息处理实现
优化实体类equals和hashCode方法
修复控制器路径和日志配置
添加查询服务和任务接口方法

common/src/main/java/com/ecep/contract/model/DeliverySignMethod.java

@@ -1,5 +1,6 @@
 package com.ecep.contract.model;
 
+import java.io.Serializable;
 import java.util.Objects;
 
 import com.ecep.contract.util.HibernateProxyUtils;
@@ -24,7 +25,8 @@ import lombok.ToString;
 @Setter
 @Entity
 @Table(name = "PRODUCT_DELIVERY_SIGN_METHOD", schema = "supplier_ms")
-public class DeliverySignMethod implements BasedEntity, IdentityEntity {
+public class DeliverySignMethod implements BasedEntity, IdentityEntity , Serializable {
+    private static final long serialVersionUID = 1L;
     @Id
     @Column(name = "ID", nullable = false)
     @GeneratedValue(strategy = GenerationType.IDENTITY)