Remove AdminMenu from public site header

Hide admin interface completely from public site. Admins access /admin/login
directly. Cleaner separation between customer-facing UI and back office.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.claude/settings.local.json

@@ -12,7 +12,9 @@
       "Bash(git restore *)",
       "Bash(git reset *)",
       "Bash(git checkout *)",
-      "Bash(git commit -m ' *)"
+      "Bash(git commit -m ' *)",
+      "Bash(git commit -m 'Remove AdminMenu from public site header *)",
+      "Bash(git push *)"
     ]
   }
 }