feat(catalog): add ego-browser to built-in tab catalog

Register ego-browser as a recommended TAB plugin in the built-in catalog
(Side card settings → 侧边栏内容 → add-tab modal). Entry follows the
PluginEntry contract: unique id @dsh-external/ego-browser, GitHub URL,
localized description (zh+en added to locales.ts), and an install script
that starts at cd ~/.dsh and uses the dsh plugin CLI. The plugin registers
a sidebar tab for the agent browser as an optional peer of better-sidebar
(tab when present, floating bubble when not).

src/client/plugins-tabs.ts

@@ -24,6 +24,15 @@ export const builtinTabPlugins: readonly PluginEntry[] = [
     // context consistent with the other entries.
     install: 'cd ~/.dsh && dsh plugin --profile web add "github:fuhefei/dsh-sentinel#v0.7.0"',
   },
+  {
+    id: '@dsh-external/ego-browser',
+    name: 'ego-browser Agent 浏览器',
+    url: 'https://github.com/Fisfzy/ego-browser',
+    description: () => t('pluginEgoBrowserDesc'),
+    // Registers a sidebar tab for the agent browser; optional peer of
+    // better-sidebar (auto-tab when present, floating bubble when not).
+    install: 'cd ~/.dsh && dsh plugin --profile web add dsh-better-sidebar && dsh plugin --profile web add git+https://github.com/Fisfzy/ego-browser.git',
+  },
   {
     id: 'dsh-docs-panel',
     name: 'dsh-docs-panel 全局文档',