fix(smoke): pin api to 1 replica in farm-smoke override

[sssaturX]

Problem

scripts/docker-smoke-mms-offline.sh (and -live.sh, same override) aborts at the Starting api + ws-service step with:

Error response from daemon: failed to set up container networking:
driver failed programming external connectivity on endpoint farm-api-3 ...
Bind for 127.0.0.1:13000 failed: port is already allocated

Root cause

docker-compose.yml declares api.deploy.replicas: 3 (production shape). The smoke override docker-compose.farm-smoke-override.yml adds a fixed host-port mapping:

api:
  ports:
    - "127.0.0.1:13000:3000"

A host port can be bound by only one container. Compose tries to start farm-api-1, farm-api-2, farm-api-3 — the first succeeds, the rest fail with port is already allocated, and the whole docker compose up exits non-zero before the smoke script can run any checks.

Fix

Set deploy.replicas: 1 on the api service in the smoke-only override. Compose deep-merges deploy, so resources and other base-file fields are preserved. Production docker-compose.yml is untouched.

api:
  deploy:
    replicas: 1
  ports:
    - "127.0.0.1:13000:3000"
  ...

Verification

• python3 -c 'import yaml; yaml.safe_load(open("docker-compose.farm-smoke-override.yml"))' ✅
• docker compose config (when docker is available) shows api with a single replica and the correct port mapping.
• scripts/docker-smoke-mms-offline.sh should now proceed past Starting api + ws-service and reach the health/ready polling loop.

No production behaviour changes. The override header already states "smoke-test override ONLY. Do not merge for production deploys."