chore(k8s): send OTLP straight to the Frostmoln Alloy receiver

The AWS-era endpoint (k8s-monitoring-alloy*.monitoring) only resolves through an ExternalName alias the Frostmoln observability agent keeps for the migration; point at alloy-logs.observability directly so the alias can go.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H6eVuR4Yt3m7TbDTDwyZJi

k8s/deploy.yaml

@@ -78,7 +78,7 @@ spec:
           containerPort: 8080
         env:
         - name: OTEL_EXPORTER_OTLP_ENDPOINT
-          value: http://k8s-monitoring-alloy.monitoring.svc.cluster.local:4318
+          value: http://alloy-logs.observability.svc.cluster.local:4318
         envFrom:
         - configMapRef:
             name: schemas