Enhance image upload and background management: Update Docker configuration to create a dedicated backgrounds directory for uploaded images, modify API routes to handle background images specifically, and improve README documentation to reflect these changes. Additionally, refactor components to utilize the new Avatar component for consistent avatar rendering across the application.

docker-compose.yml

@@ -16,7 +16,7 @@ services:
     volumes:
       # Persist database (override DATA_PATH env var to change location)
       - ${PRISMA_DATA_PATH:-/Volumes/EXTERNAL_USB/sites/got-gaming/data}:/app/data
-      # Persist uploaded images
+      # Persist uploaded images (avatars and backgrounds)
       - ${UPLOADS_PATH:-./uploads}:/app/public/uploads
       - ./prisma/migrations:/app/prisma/migrations
     restart: unless-stopped