Write YOUTUBE_API_KEY to .env.production file

- Echo the API key value to debug if it's actually set
- Write to .env.production file for Next.js to read
- Display contents of .env.production to verify

🤖 Generated with [Claude Code](https://claude.ai/code)

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

amplify.yml

@@ -8,7 +8,10 @@ frontend:
       commands:
         - echo "Build started on `date`"
         - echo "Configuring environment variables..."
-        - export YOUTUBE_API_KEY="${YOUTUBE_API_KEY}"
+        - echo "YOUTUBE_API_KEY value: ${YOUTUBE_API_KEY}"
+        - echo "YOUTUBE_API_KEY=${YOUTUBE_API_KEY}" > .env.production
+        - echo "Contents of .env.production:"
+        - cat .env.production
         - npm run build
   artifacts:
     baseDirectory: .next