chore(docker): remove container healthcheck

Coolify performs its own liveness probe, so the in-image HEALTHCHECK is
redundant.

Dockerfile

@@ -23,6 +23,4 @@ COPY --from=build --chown=node:node /app/.output ./.output
 COPY --from=build --chown=node:node /app/server/db/migrations ./server/db/migrations
 USER node
 EXPOSE 3000
-HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
-  CMD wget -qO- http://127.0.0.1:3000/api/health >/dev/null 2>&1 || exit 1
 CMD ["node", ".output/server/index.mjs"]