feat: log requests, errors and exits

[turegjorup]

Adds logging to app.js, and runs Express in production mode on the server.

https://leantime.itkdev.dk/#/tickets/showTicket/8293

Changes

• One line per request: method, path, status, duration, row count, client IP.
• A line for requests the client aborted before the response was sent (req GET ... aborted after 30012ms). finish never fires for those, and they disappear entirely once nginx is gone (refactor: route traefik straight to node and drop nginx #23).
• Route errors logged with message and stack.
• A warning when an empty result falls back to the cache, naming the route and the cache age.
• Exit cause logged for uncaughtException, unhandledRejection, SIGTERM and SIGINT.
• docker-compose.server.yml: NODE_ENV=production. It was unset, so Express ran in development mode: its default error handler logged the stack a second time and put the stack trace, server names included, in the 500 response body.

Console only. No new dependency.

Verify

cp config.dev.js.dist config.js
docker compose run --rm node yarn install
docker compose --profile db up --detach
docker compose run --rm node node .docker/mssql/seed.js
docker compose run --rm node node test.js
docker compose logs node

Expected: 7/7 passed, and lines of the form req GET /posidryeartsl.csv 200 142ms rows=500 ip=... in the node log.

Stacked on #16.