RydersWorld Image Thumbnails - Signed AWS Image Handler

We implemented an AWS-native image thumbnail pipeline using the Serverless Image Handler (CloudFront + Lambda + API Gateway) with signed URLs. This keeps private S3 originals secure while delivering fast, resized images across the app. The app now generates signed image URLs based on S3 keys, and when the proxy is configured the gallery/calendar/docs images are served at optimized sizes. This lays the foundation for enterprise-grade performance without manually backfilling existing images.