feat(homepage): point the Audiobookshelf tile at the vhost

The tile carried the bare LAN IP. The probe stays the LAN host:port so the
homepage checker keeps measuring the app rather than the auth chain in front of
it.

shared/homepage/services.json

@@ -516,7 +516,7 @@
     "category": "admin",
     "section": "Media Library Apps",
     "description": "Audiobook server for the entropy library: its own SQLite library, its own login, per-listener positions.",
-    "url": "http://192.168.0.235:8000",
+    "url": "http://abs.franksdank.cloud/audiobookshelf/",
     "docs": "",
     "probe": "192.168.0.235:8000",
     "method": "http",