feat: Remove unused ANTHROPIC_API_KEY from deployment config

Author: jammy0903

render.yaml

@@ -23,8 +23,6 @@ services:
         value: https://api.deepseek.com
       - key: CORS_ORIGINS
         value: https://codeinsight.vercel.app
-      - key: ANTHROPIC_API_KEY
-        sync: false
       - key: FIREBASE_PROJECT_ID
         sync: false
       - key: FIREBASE_CLIENT_EMAIL