Fix Next.js API route for Amplify WEB_COMPUTE platform

- Add .env.production for Amplify environment variable mapping
- Update artifacts configuration for WEB_COMPUTE platform
- Add explicit nodejs runtime for API route
- Enable serverActions in Next.js config
- Add debugging output for environment variables

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

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

.env.production

@@ -0,0 +1,5 @@
+# This file is for Amplify to know which env vars to expose to Next.js
+# The actual values come from Amplify Environment Variables
+CONFLUENCE_API_URL=${CONFLUENCE_API_URL}
+CONFLUENCE_TOKEN=${CONFLUENCE_TOKEN}
+CONFLUENCE_PAGE_ID=${CONFLUENCE_PAGE_ID}