arr fleet: FrankBook-Pro is the sole deployment, all egress VPN-gated

FrankBook-Pro becomes the only *arr/qBittorrent deployment. Every fleet
container (qB + five arrs) now shares gluetun's netns, so all egress —
torrent, indexer APIs, metadata lookups — exits the WireGuard tunnel by
construction (AllowedIPs=0.0.0.0/0); the arrs' own ports publish on the
gluetun unit, none on the arr units themselves.

- dankserver/compose.yaml: remove the six arr services (the Aug 20 compose
  copy — never healthy, superseded; config dirs trashed on the host)
- dankclaw/Caddyfile + shared/homepage/services.json: arr vhosts and
  probes repoint 192.168.0.235 -> 192.168.0.112 (FrankBook-Pro)
- frankbook-pro units: five arrs join gluetun netns (Wants/After/Network);
  gluetun publishes 9696/8989/7878/8686/8787 alongside 8080/6881
- tests/frankbook_quadlet.bats: new VPN egress seam — every arr+qB unit
  must share gluetun's netns and publish no port; gluetun must publish the
  whole fleet's ports
- deploy-plan.py: gluetun changes carry the whole netns family (a gluetun
  recreation kills all six joiners); dankserver compose set loses the arrs
- AGENTS.md: deployment is complete only when unit tests AND the Playwright
  E2E suite both pass

shared/homepage/services.json

@@ -104,7 +104,7 @@
     "description": "TV series library and automation.",
     "url": "http://sonarr.franksdank.cloud",
     "docs": "",
-    "probe": "192.168.0.235:8989",
+    "probe": "192.168.0.112:8989",
     "method": "http",
     "wip": false,
     "showLink": true
@@ -259,7 +259,7 @@
     "description": "Indexer manager.",
     "url": "http://prowlarr.franksdank.cloud",
     "docs": "",
-    "probe": "192.168.0.235:9696",
+    "probe": "192.168.0.112:9696",
     "method": "http",
     "wip": false,
     "showLink": true
@@ -270,7 +270,7 @@
     "description": "Movie library and automation.",
     "url": "http://radarr.franksdank.cloud",
     "docs": "",
-    "probe": "192.168.0.235:7878",
+    "probe": "192.168.0.112:7878",
     "method": "http",
     "wip": false,
     "showLink": true
@@ -281,7 +281,7 @@
     "description": "Book library and automation.",
     "url": "http://readarr.franksdank.cloud",
     "docs": "",
-    "probe": "192.168.0.235:8787",
+    "probe": "192.168.0.112:8787",
     "method": "http",
     "wip": false,
     "showLink": true
@@ -292,7 +292,7 @@
     "description": "Music library and automation.",
     "url": "http://lidarr.franksdank.cloud",
     "docs": "",
-    "probe": "192.168.0.235:8686",
+    "probe": "192.168.0.112:8686",
     "method": "http",
     "wip": false,
     "showLink": true
@@ -303,7 +303,7 @@
     "description": "Torrent client.",
     "url": "http://qbittorrent.franksdank.cloud",
     "docs": "",
-    "probe": "192.168.0.235:8080",
+    "probe": "192.168.0.112:8080",
     "method": "http",
     "wip": false,
     "showLink": true