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/ProjectQuotation.java

@@ -30,7 +30,8 @@ import lombok.ToString;
 @Entity
 @Table(name = "PROJECT_QUOTATION")
 @ToString
-public class ProjectQuotation implements IdentityEntity, ProjectBasedEntity {
+public class ProjectQuotation implements IdentityEntity, ProjectBasedEntity, java.io.Serializable {
+    private static final long serialVersionUID = 1L;
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "ID", nullable = false)