Point Audiobookshelf at Pocket ID and drop podcasts

Audiobookshelf's OIDC settings (stored in its own database) now use the
Pocket ID client in vault_audiobookshelf.pocketid instead of Authentik, so
the container needs the Pocket ID hairpin entry. The podcasts library was
deleted and its files purged, so its volume goes too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

roles/docker/templates/audiobookshelf-compose.yml.j2

@@ -4,21 +4,18 @@ services:
     restart: unless-stopped
     volumes:
       - audiobooks:/audiobooks
-      - podcasts:/podcasts
       - config:/config
       - metadata:/metadata
     environment:
       - TZ=America/Denver
       - DISABLE_SSRF_REQUEST_FILTER=1
     extra_hosts:
-      - '{{ subdomains.auth }}:{{ docker.hairpin_ip }}'
+      - '{{ subdomains.pocketid }}:{{ docker.hairpin_ip }}'
     labels:
       mag37.dockcheck.update: true
 volumes:
   audiobooks:
     driver: local
-  podcasts:
-    driver: local
   config:
     driver: local
   metadata: