Fix default listen port to match deployment assets

[Lougarou]

Summary

• src/replicator/appsettings.json hardcoded "Urls": "http://*:5098", which wins over the ASPNETCORE_URLS env var that the Dockerfile sets to http://*:5000. Result: the container listens on 5098 by default.
• Every piece of deployment config assumes 5000: Dockerfile EXPOSE 5000 / ENV ASPNETCORE_URLS, compose/docker-compose.yml 5000:5000, compose/prometheus.yml scrape target replicator:5000, charts/replicator/templates/service.yaml (prometheus.io/port: "5000", port: 5000, targetPort: 5000), charts/replicator/templates/statefulset.yaml probes/container port 5000, and the docs (docs/src/content/docs/deployment/docker.mdx → http://localhost:5000).
• So the published image's metrics endpoint was unreachable from any Prometheus scraper wired up per the shipped compose/Helm assets. Setting ASPNETCORE_URLS at deploy time does not fix it, because appsettings.json is a later config source in the running app.

This PR changes the bundled default to http://*:5000, aligning the app with the rest of the deployment stack.

Reproduction (before fix)

$ docker build -t replicator:repro .
$ docker run -d --name r -v <cfg>:/app/config -p 15000:5000 -p 15098:5098 replicator:repro
$ docker exec r sh -c 'echo $ASPNETCORE_URLS'
http://*:5000
$ docker logs r | grep listening
"Now listening on: \"http://[::]:5098\""
$ curl -o /dev/null -w '%{http_code}\n' http://localhost:15000/metrics
000
$ curl -o /dev/null -w '%{http_code}\n' http://localhost:15098/metrics
200

After fix

$ docker logs r | grep listening
"Now listening on: \"http://[::]:5000\""
$ curl -o /dev/null -w '%{http_code}\n' http://localhost:15000/metrics
200

Test plan

• docker build . succeeds
• Container started from the built image listens on :5000 (confirm via logs and curl /metrics)
• docker compose -f compose/docker-compose.yml up — Prometheus at :9090 shows the replicator target as UP and scrapes metrics
• Helm chart deploy — liveness/readiness probes on :5000 pass, service scraping works
• Local dotnet run --project src/replicator still starts (UI/metrics now on :5000 locally too; previously :5098)

🤖 Generated with Claude Code

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