emby: fix lying healthcheck (curl absent; image ships only BusyBox)

The healthcheck ran 'curl -f', but the Emby image has neither curl nor a
standalone wget -- only BusyBox. The probe ENOENT'd every run, the container
stayed permanently unhealthy, and Traefik will not route to an unhealthy
container, so the customer got a 404 while Emby itself was serving fine.

Switched to the BusyBox-wget family via the /bin/busybox multi-call binary.

Campaign 7 catalog sweep.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Nn3VgQk9iwEGgyx6QJ2NvE

templates/emby/docker-compose.yml

@@ -29,7 +29,10 @@ services:
         limits:
           memory: 2048M
     healthcheck:
-      test: ["CMD", "curl", "-f", "http://127.0.0.1:8096/emby/system/ping"]
+      # Az Emby képfájlban NINCS curl és nincs önálló wget — csak BusyBox van.
+      # A korábbi curl-próba ezért soha nem futott le, a konténer véglegesen
+      # unhealthy maradt, és a Traefik nem irányított rá forgalmat (404).
+      test: ["CMD", "/bin/busybox", "wget", "--spider", "-q", "http://127.0.0.1:8096/emby/system/ping"]
       interval: 30s
       timeout: 5s
       retries: 3