feat: add docker-compose example and update GHCR deployment links

docker-compose.example.yml

@@ -0,0 +1,25 @@
+services:
+  koala-sync:
+    image: ghcr.io/shik3i/koalasync:latest
+    container_name: KoalaSync
+    restart: always
+    ports:
+      - "3000:3000"
+    environment:
+      - TZ=Europe/Berlin
+      - PORT=3000
+      - MIN_VERSION=1.0.0
+      - MAX_ROOMS=100
+      - MAX_PEERS_PER_ROOM=50
+    # KoalaSync uses in-memory storage for the relay, 
+    # so no persistent database volume is required.
+    pids_limit: 2048
+    # Example for custom network (e.g., Unraid/Macvlan)
+    # networks:
+    #   custom_network:
+    #     ipv4_address: 192.168.1.XXX
+
+# networks:
+#   custom_network:
+#     external: true
+#     name: br0