fix: 修复公告关闭功能 - 当次关闭与永久关闭区分

问题：不管选择"当次关闭"还是"永久关闭"，都会永久关闭公告

修复：
- 当次关闭：使用 sessionStorage + pageToken
  - pageToken 基于 performance.timeOrigin 生成
  - 刷新页面后 token 变化，公告重新显示
- 永久关闭：使用 localStorage
  - 持久化存储，刷新/重开后不再显示

修改文件：
- app-frontend/src/layouts/AppLayout.vue
- templates/index.html

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

static/app/assets/accounts-BYq3lLev.js

@@ -0,0 +1 @@
+import{p as c}from"./index-CGLq5RWF.js";async function o(t={}){const{data:a}=await c.get("/accounts",{params:t});return a}async function u(t){const{data:a}=await c.post("/accounts",t);return a}async function r(t,a){const{data:n}=await c.put(`/accounts/${t}`,a);return n}async function e(t){const{data:a}=await c.delete(`/accounts/${t}`);return a}async function i(t,a){const{data:n}=await c.put(`/accounts/${t}/remark`,a);return n}async function p(t,a){const{data:n}=await c.post(`/accounts/${t}/start`,a);return n}async function d(t){const{data:a}=await c.post(`/accounts/${t}/stop`,{});return a}async function f(t){const{data:a}=await c.post("/accounts/batch/start",t);return a}async function w(t){const{data:a}=await c.post("/accounts/batch/stop",t);return a}async function y(){const{data:t}=await c.post("/accounts/clear",{});return t}async function A(t,a={}){const{data:n}=await c.post(`/accounts/${t}/screenshot`,a);return n}export{w as a,f as b,y as c,d,e,o as f,u as g,i as h,p as s,A as t,r as u};