Simplify to just use environment variables

- Remove unnecessary Lambda function and API route
- Remove backend deployment from amplify.yml
- Just use process.env.YOUTUBE_API_KEY directly
- Keep it simple - no need for complex secret management

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

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

amplify.yml

@@ -1,10 +1,4 @@
 version: 1
-backend:
-  phases:
-    build:
-      commands:
-        - npm ci
-        - npx ampx pipeline-deploy --branch $AWS_BRANCH --app-id $AWS_APP_ID
 frontend:
   phases:
     preBuild:
@@ -12,9 +6,6 @@ frontend:
         - npm ci
     build:
       commands:
-        - echo "Build started on `date`"
-        - echo "Available environment variables:"
-        - printenv | grep -E "(YOUTUBE|AMPLIFY)" || echo "No relevant env vars found"
         - npm run build
   artifacts:
     baseDirectory: .next