fix(router): decommission legacy GPU router across contracts and fleet scripts

Router container, image, and config are purged on CT 116 (verified: no
container, no image, inference-harness-router:latest removed, :9000 free,
11 containers healthy, 7 models, live syslog-auto completion OK). Updates:

- gpu-fleet.prose.md: topology diagram rebuilt without the router tier
- gpu-monitor / gpu-self-heal / litellm-health / litellm-self-heal: router steps dropped
- infrastructure-control.prose.md: container inventory + litellm row corrected
- scripts/daily-infra-report.py, scripts/prose-ai-review.sh: host-scoped checks

Verified: 40/40 anchors matched uniquely, 0 U+FFFD across changed files,
daily-infra-report.py compiles, no stray harness-router references remain.

infrastructure-monitoring.prose.md

@@ -173,7 +173,7 @@ curl -s http://192.168.68.116:3001/api/health | jq '{status, version}'
 # Expected: {"status":"ok","version":"..."}
 
 # LiteLLM metrics (Prometheus endpoint)
-curl -s http://192.168.68.116:4001/metrics | head -20
+curl -s http://192.168.68.116:4000/metrics | head -20
 # Expected: Prometheus-formatted metrics output
 ```
 
@@ -242,5 +242,5 @@ curl -s http://192.168.68.116:9090/api/v1/targets
 curl -s http://192.168.68.116:3001/api/health
 
 # LiteLLM metrics (already live)
-curl -s http://192.168.68.116:4001/metrics | head -20
+curl -s http://192.168.68.116:4000/metrics | head -20
 ```