feat(web): move runtime status to dashboard, clean up plugin debug popover

Add SystemStatusCards component to the monitoring dashboard showing
Plugin Runtime and Box Runtime connection status with details (backend,
profile, sandbox count). Remove all Box/session status from the plugin
page debug popover — it now only shows debug URL and key.

Includes i18n for all 8 supported languages.

web/src/i18n/locales/zh-Hans.ts

@@ -1199,6 +1199,16 @@ const zhHans = {
       sessions: '会话记录',
       feedback: '用户反馈',
     },
+    pluginRuntime: '插件运行时',
+    boxRuntime: 'Box 运行时',
+    connected: '已连接',
+    disconnected: '未连接',
+    disabled: '已禁用',
+    statusDetail: '状态',
+    pluginDisabled: '插件系统已禁用',
+    boxBackend: '后端',
+    boxProfile: '配置',
+    boxSandboxes: '沙箱数',
   },
   limitation: {
     maxBotsReached: