Add Anki route and fix Jellyfin cache disk exhaustion

- Add adyrem.duckdns.org/Anki → claude-code VM:4002 via Traefik
- Add anki.homelab DNS entry to Pi-hole
- Mount Jellyfin transcode cache to /media/transcodes (HDD) instead of
  anonymous Docker volume on root disk; prevents root disk from filling up

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ansible/roles/traefik/defaults/main.yml

@@ -17,6 +17,12 @@ traefik_services:
     host: "devbox.homelab"
     backend: "http://10.10.2.10:4001"
     public_host: "adyrem.duckdns.org"
+  - name: anki
+    host: "anki.homelab"
+    backend: "http://10.10.2.10:4002"
+    public_host: "adyrem.duckdns.org"
+    public_path: "/Anki"
+    strip_prefix: "/Anki"
   - name: mtg
     host: "mtg.homelab"
     backend: "http://10.10.2.10:3000"