prod: hardened deploy config for srv1289857 — prod container names/ports (frontend :3882, backend :8010, db :5440), Dockerfile.prod (uvicorn --workers 1, init_db race fix), next.config.ts BACKEND_INTERNAL_URL build-arg rewrite, celery worker/beat healthchecks (no-HTTP daemons: inspect ping w/ tmp-file output, /proc cmdline grep; pgrep unavailable in image), pgbouncer removed, restart: unless-stopped

Dockerfile

@@ -18,10 +18,13 @@ COPY . .
 
 # Set environment variables for build
 ENV NEXT_TELEMETRY_DISABLED=1
-
 # Accept API URL as build arg — defaults to Docker-internal service name
 ARG NEXT_PUBLIC_API_URL=http://backend:8000
 ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
+# BACKEND_INTERNAL_URL drives the server-side /api rewrite; must be a build-time
+# arg so it is compiled into next.config.ts (which is evaluated at build time).
+ARG BACKEND_INTERNAL_URL
+ENV BACKEND_INTERNAL_URL=$BACKEND_INTERNAL_URL
 
 RUN npm run build