fix(api): 修正删除接口参数值从delete改为del

更新API端点参数值以匹配后端接口规范，同时更新相关文档说明

@@ -34,7 +34,7 @@ paths:
           in: query
           description: ''
           required: false
-          example: delete
+          example: del
           schema:
             type: string
         - name: i

@@ -2,7 +2,7 @@ import { fn, fetch } from '@/api/fn';
 
 const Api = {
   Add: '/srv/?a=proposal&t=add',
-  Delete: '/srv/?a=proposal&t=delete',
+  Delete: '/srv/?a=proposal&t=del',
   List: '/srv/?a=proposal&t=list',
   View: '/srv/?a=proposal&t=view',
 }