Add sanitized compose files for 21 rocky-docker stacks missing from the mirror

audiobookshelf, bazarr, beets, dashy, dockhand, docker-socket-proxy,
emby, ghost (+umami), jellyfin, kodi-mariadb, kopia, lidarr,
music-assistant, prowlarr, qbittorrent, radarr, seerr, sonarr, tdarr,
tinymediamanager, trilium — these run in the fleet today but had no
public entry at all. Same sanitization convention as the rest of the
repo (paths -> /path/to/..., secrets left as bare ${VAR} refs, no CA
trust details).

Docker/Dockhand/docker-compose.yaml

@@ -0,0 +1,49 @@
+services:
+  socket-proxy:
+    image: tecnativa/docker-socket-proxy
+    container_name: dockhand-socket-proxy
+    restart: always
+    environment:
+      # Required for Dockhand core functionality
+      - CONTAINERS=1
+      - IMAGES=1
+      - NETWORKS=1
+      - VOLUMES=1
+      - EVENTS=1
+      - POST=1
+      - DELETE=1
+      # Required for dashboard host info and disk usage
+      - INFO=1
+      - SYSTEM=1
+      # Required for vulnerability scanning
+      - ALLOW_START=1
+      - ALLOW_STOP=1
+      - ALLOW_RESTARTS=1
+      # Optional: enable for terminal access
+      - EXEC=1
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+    networks:
+      - dockhand-net
+
+  dockhand:
+    image: fnsys/dockhand:latest
+    container_name: dockhand
+    restart: always
+    depends_on:
+      - socket-proxy
+    environment:
+      - PUID=1000
+      - PGID=1000
+    group_add:
+      - "996"
+    ports:
+      - ${HTTP_PORT}:3000
+    volumes:
+      - /path/to/dockhand/dockhand_data:/app/data
+    networks:
+      - dockhand-net
+
+networks:
+  dockhand-net:
+    external: true