feat(flowable): 添加待办任务数量统计功能

在FlowQueryVo中新增category字段用于流程分类筛选
实现待办任务数量统计接口，支持按分类筛选统计

srs-admin/src/main/java/com/srs/web/controller/flowable/FlowTaskController.java

@@ -58,6 +58,12 @@ public class FlowTaskController {
         return flowTaskService.todoList(queryVo);
     }
 
+    @ApiOperation(value = "获取待办数量统计", response = Integer.class)
+    @GetMapping(value = "/todoCount")
+    public AjaxResult todoCount(FlowQueryVo queryVo) {
+        return flowTaskService.todoCount(queryVo);
+    }
+
     @ApiOperation(value = "获取已办任务", response = FlowTaskDto.class)
     @GetMapping(value = "/finishedList")
     public AjaxResult finishedList(FlowQueryVo queryVo) throws Exception {