♻️ refactor(layout): rename workspace switcher to system brand

Rename the layout branding component to reflect that it displays the system identity rather than switching workspaces. Update header usage and layout exports, and remove the now-unused workspace data dependency.

web/default/src/i18n/locales/zh.json

@@ -1826,6 +1826,7 @@
     "Go back and edit": "返回修改",
     "Go to Dashboard": "前往仪表板",
     "Go to first page": "前往首页",
+    "Go to home": "返回主页",
     "Go to io.net API Keys": "前往 io.net API 密钥",
     "Go to last page": "前往末页",
     "Go to next page": "前往下一页",