Doc audit: fix all broken links + correct stale facts across the KB

Fanned out 5 read-only doc-auditor subagents (one per service group) that
fact-checked the knowledge base against the live system + repo config,
researched official setup docs online, and verified progress. Applied:
- All 34 broken links fixed (real pages / external URLs / correct relative
  paths); 0 broken links remain. No .AGENTTRASH links (the 4 mentions are
  accurate descriptive text, not links).
- Fact-check fixes: Readarr retired (May 2026), Radarr v4->v6, Calibre
  9.2.1 live, Calibre-Web 0.6.25 live, Copyparty v1.20.21, LLM index
  ncmoe 38 + 786432 ctx, frank-default-small active (not frank-pp-worker),
  Hermes/SearXNG/Grafana hostnames, Loki/Alloy local images, Observability
  diagram (Promtail->Alloy), VLLM retired note, DFlash status, benchmark
  live-drift notes, Homepage test count 116.

docs/Infrastructure/Grafana.md

@@ -1,8 +1,8 @@
 # Grafana
 
-Grafana visualizes the metrics that Prometheus collects from every service. It runs on Dankclaw and is reachable at `grafana.dankclaw.local`.
+Grafana visualizes the metrics that Prometheus collects from every service. It runs on Dankclaw and is reachable at `grafana.franksdank.cloud` (via Caddy, with basicauth).
 
-**Host:** Dankclaw — **Hostname:** `grafana.dankclaw.local` — **Port:** 3002 — **Docs:** https://grafana.com/docs
+**Host:** Dankclaw — **Hostname:** `grafana.franksdank.cloud` — **Port:** 3002 (internal) — **Docs:** https://grafana.com/docs
 
 ## Facts
 
@@ -20,7 +20,7 @@ Grafana visualizes the metrics that Prometheus collects from every service. It r
 environment:
   GF_SECURITY_ADMIN_USER: "${GRAFANA_ADMIN_USER}"
   GF_SECURITY_ADMIN_PASSWORD: "${GRAFANA_ADMIN_PASSWORD}"
-  GF_SERVER_ROOT_URL: "http://grafana.dankclaw.local"
+  GF_SERVER_ROOT_URL: "https://grafana.franksdank.cloud"
 volumes:
   - /opt/grafana/data:/var/lib/grafana
   - /opt/grafana/provisioning:/etc/grafana/provisioning:ro