Add dynamic breadcrumb navigation and update kanzlei routes under /demo

internal_frontend/lib/breadcrumb-map.ts

@@ -0,0 +1,8 @@
+// lib/breadcrumb-map.ts
+export const breadcrumbMap: Record<string, string> = {
+    'dashboard': 'Dashboard',
+    'settings': 'Settings',
+    'demo': 'Demo',
+    'users': 'User Management',
+    // Add more mappings as needed
+};