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

client/src/main/java/com/ecep/contract/service/EmployeeService.java

@@ -1,12 +1,15 @@
 package com.ecep.contract.service;
 
-import java.util.List;
-
-import org.springframework.stereotype.Service;
-
+import com.ecep.contract.PageContent;
 import com.ecep.contract.model.Employee;
 import com.ecep.contract.model.EmployeeRole;
 import com.ecep.contract.vm.EmployeeViewModel;
+import com.fasterxml.jackson.databind.JsonNode;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.ExecutionException;
 
 @Service
 public class EmployeeService extends QueryService<Employee, EmployeeViewModel> {
@@ -19,14 +22,33 @@ public class EmployeeService extends QueryService<Employee, EmployeeViewModel> {
     }
 
     public List<EmployeeRole> getRolesByEmployeeId(Integer id) {
-        // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'getRolesByEmployeeId'");
+        try {
+            return async("getRolesByEmployeeId", List.of(id), List.of(Integer.class)).handle((response, ex) -> {
+                if (response != null) {
+                    try {
+                        List<EmployeeRole> content = new ArrayList<>();
+                        for (JsonNode node : response) {
+                            EmployeeRole newEntity = new EmployeeRole();
+                            objectMapper.updateValue(newEntity, node);
+                            content.add(newEntity);
+                        }
+                        return content;
+                    } catch (Exception e) {
+                        throw new RuntimeException(response.toString(), e);
+                    }
+                }
+                return null;
+            }).get();
+        } catch (InterruptedException | ExecutionException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     public void updateActive(int sessionId) {
         // TODO Auto-generated method stub
         throw new UnsupportedOperationException("Unimplemented method 'updateActive'");
     }
+
     public Employee findByCode(String personCode) {
         // TODO Auto-generated method stub
         throw new UnsupportedOperationException("Unimplemented method 'findByCode'");