refactor: 删除渲染机管理相关代码

- 移除 RenderWorkerController、RenderWorkerMapper、RenderWorkerEntity、RenderWorkerService 等类
- 删除相关的 XML 配置文件
- 清理数据库表结构

src/main/resources/mapper/TaskMapper.xml

@@ -84,13 +84,6 @@
         from task
         where status = 0
           and worker_id is null
-          and NOT EXISTS (
-            SELECT 1
-            FROM render_worker rw
-            WHERE
-                rw.status = 1
-              AND FIND_IN_SET(task.scenic_id, rw.scenic_only) > 0  -- 检查scenic_id是否在逗号分隔的字符串中
-        )
         limit 1
     </select>
     <select id="selectAllNotRunning" resultType="com.ycwl.basic.model.pc.task.entity.TaskEntity">