fix: 统一工单优先级类型为Integer

修改：
- TrafficThresholdConfig.orderPriority: String -> Integer
- CleanOrderCreateEventDTO.priority: String -> Integer
- CleanOrderCreateEventHandler: 移除Integer.parseInt调用

与数据库tinyint类型保持一致

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

viewsh-module-iot/viewsh-module-iot-server/src/main/java/com/viewsh/module/iot/dal/dataobject/integration/clean/TrafficThresholdConfig.java

@@ -37,9 +37,9 @@ public class TrafficThresholdConfig {
     /**
      * 工单优先级
      * <p>
-     * P0 = 紧急
-     * P1 = 重要
-     * P2 = 普通
+     * 0 = P0紧急
+     * 1 = P1重要
+     * 2 = P2普通
      */
-    private String orderPriority;
+    private Integer orderPriority;
 }