refactor(module_task): 移除节点分类相关代码

移除节点分类功能，包括前后端相关字段、枚举、表单和展示逻辑
优化任务调度器异常处理和日志记录
改进WebSocket聊天控制器的错误处理和连接关闭逻辑
增强节点调试功能，添加执行成功提示和跳转引导

backend/app/plugin/module_task/node/service.py

@@ -2,6 +2,7 @@ from app.api.v1.module_system.auth.schema import AuthSchema
 from app.core.ap_scheduler import SchedulerUtil
 from app.core.exceptions import CustomException
 from app.utils.cron_util import CronUtil
+from apscheduler.jobstores.base import JobLookupError
 
 from .crud import NodeCRUD
 from .schema import (
@@ -40,7 +41,6 @@ class NodeService:
                 "id": obj.id,
                 "name": obj.name,
                 "code": obj.code,
-                "category": obj.category,
                 "func": obj.func,
                 "args": obj.args,
                 "kwargs": obj.kwargs,
@@ -142,7 +142,11 @@ class NodeService:
             exist_obj = await NodeCRUD(auth).get_obj_by_id_crud(id=id)
             if not exist_obj:
                 raise CustomException(msg="删除失败，该节点不存在")
-            SchedulerUtil.remove_job(job_id=id)
+            try:
+                SchedulerUtil.remove_job(job_id=id)
+            except JobLookupError:
+                # 作业不存在，忽略异常，继续删除数据库记录
+                pass
         await NodeCRUD(auth).delete_obj_crud(ids=ids)
 
     @classmethod