feat(adminfront): remove unused tenant dashboard and update global overview quick links

adminfront/src/components/layout/AppLayout.tsx

@@ -24,11 +24,6 @@ import RoleSwitcher from "./RoleSwitcher";
 
 const navItems = [
   { label: "ui.admin.nav.overview", to: "/", icon: LayoutDashboard },
-  {
-    label: "ui.admin.nav.tenant_dashboard",
-    to: "/dashboard",
-    icon: ShieldHalf,
-  },
   {
     label: "ui.admin.nav.tenants",
     to: "/tenants",