refactor(client): 重构服务类继承关系并统一使用QueryService

重构所有服务类，使其继承自QueryService接口，统一数据查询逻辑。同时为服务类添加@Service注解，确保Spring容器管理。更新相关FXML文件的控制器路径，从manager.ds调整为controller目录结构。调整pom.xml版本号至0.0.84-SNAPSHOT。新增MessageNotitfication和SimpleMessage消息类，提供基础消息结构支持。

server/src/main/java/com/ecep/contract/controller/WebSocketController.java

@@ -0,0 +1,82 @@
+package com.ecep.contract.controller;
+
+import java.util.Map;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.ecep.contract.service.WebSocketService;
+
+/**
+ * WebSocket测试控制器
+ * 提供API端点用于测试WebSocket消息发送功能
+ */
+@RestController
+@RequestMapping("/api/websocket")
+public class WebSocketController {
+
+    private final WebSocketService webSocketService;
+
+    @Autowired
+    public WebSocketController(WebSocketService webSocketService) {
+        this.webSocketService = webSocketService;
+    }
+
+    /**
+     * 发送广播消息
+     * 
+     * @param payload 消息负载，包含message字段
+     * @return 响应实体
+     */
+    @PostMapping("/broadcast")
+    public ResponseEntity<?> broadcastMessage(@RequestBody Map<String, String> payload) {
+        String message = payload.get("message");
+        if (message == null || message.isEmpty()) {
+            return ResponseEntity.badRequest().body("消息内容不能为空");
+        }
+
+        webSocketService.broadcastMessage(message);
+        return ResponseEntity.ok(Map.of(
+                "success", true,
+                "message", "消息已广播",
+                "activeSessions", webSocketService.getActiveSessionCount()));
+    }
+
+    /**
+     * 发送系统通知
+     * 
+     * @param payload 通知负载，包含notification字段
+     * @return 响应实体
+     */
+    @PostMapping("/notification")
+    public ResponseEntity<?> sendNotification(@RequestBody Map<String, String> payload) {
+        String notification = payload.get("notification");
+        if (notification == null || notification.isEmpty()) {
+            return ResponseEntity.badRequest().body("通知内容不能为空");
+        }
+
+        webSocketService.sendSystemNotification(notification);
+        return ResponseEntity.ok(Map.of(
+                "success", true,
+                "message", "通知已发送",
+                "activeSessions", webSocketService.getActiveSessionCount()));
+    }
+
+    /**
+     * 获取WebSocket连接状态
+     * 
+     * @return 响应实体，包含当前活跃连接数
+     */
+    @GetMapping("/status")
+    public ResponseEntity<?> getStatus() {
+        return ResponseEntity.ok(Map.of(
+                "success", true,
+                "activeSessions", webSocketService.getActiveSessionCount(),
+                "message", "WebSocket服务运行正常"));
+    }
+}