Add express and cors dependencies

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DReRqHxSYuVfCzTzQGD9hZ

package.json

@@ -11,6 +11,8 @@
     "@types/node": "^16.18.126",
     "@types/react": "^19.2.17",
     "@types/react-dom": "^19.2.3",
+    "cors": "^2.8.6",
+    "express": "^5.2.1",
     "react": "^19.2.7",
     "react-dom": "^19.2.7",
     "react-scripts": "5.0.1",