feat(cron): register cron page in router + sidebar, fix Gateway RPC call formats

- main.js: register /cron route
- sidebar.js: add '定时任务' to '数据' section
- cron.js: fix RPC params to match Gateway API:
  - cron.list: add includeDisabled param
  - cron.add: use structured schedule{kind,expr} + payload{kind,message}
  - cron.update: use patch format
  - cron.run: add mode:'force'
  - Map Gateway CronJob state fields (lastRunStatus, lastRunAtMs, etc)

src/components/sidebar.js

@@ -33,6 +33,7 @@ const NAV_ITEMS_FULL = [
     section: '数据',
     items: [
       { route: '/memory', label: '记忆文件', icon: 'memory' },
+      { route: '/cron', label: '定时任务', icon: 'clock' },
     ]
   },
   {

src/main.js

@@ -304,6 +304,7 @@ async function boot() {
   registerRoute('/setup', () => import('./pages/setup.js'))
   registerRoute('/docker', () => import('./pages/docker.js'))
   registerRoute('/channels', () => import('./pages/channels.js'))
+  registerRoute('/cron', () => import('./pages/cron.js'))
 
   renderSidebar(sidebar)
   initRouter(content)