fix: serve uploaded images via API route (public/ is read-only in production)

Next.js bakes public/ at build time — dynamically uploaded files were
never served in Docker standalone mode. Store uploads in data/uploads/
and serve via /api/uploads/ with a rewrite for backward compatibility.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

memento-note/docker-compose.yml

@@ -50,7 +50,7 @@ services:
       # - OLLAMA_MODEL=granite4:latest
     volumes:
       # Persist uploaded images and files
-      - keep-uploads:/app/public/uploads
+      - keep-uploads:/app/data/uploads
 
       # Optional: Mount custom SSL certificates
       # - ./certs:/app/certs:ro