[SRE-002] /liveness and /readiness probes return 404 on API server (K8s pods killed)

K8s liveness and readiness probe paths `/liveness` and `/readiness` return 404 — the orchestrator registers these but the API server does not, causing all K8s pods to be killed on liveness failure.

**Evidence:**
```
curl http://localhost:8080/liveness → 404
curl http://localhost:8080/readiness → 404
```

**File:** cmd/api/routes.go:~295
**Agent:** SRE-002