feat(compose): add caddy service + network aliases

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -26,6 +26,26 @@ services:
     #   HTTP_USER: "admin"
     #   HTTP_PASS: "change-me"
 
+  caddy:
+    image: caddy:alpine
+    container_name: caddy
+    restart: unless-stopped
+    ports:
+      - "80:80"
+      # - "443:443"            # future TLS (step-ca), deferred
+    environment:
+      BASE_DOMAIN: ${BASE_DOMAIN}
+    volumes:
+      - ./caddy/Caddyfile:/etc/caddy/Caddyfile:ro
+      - ./www:/srv/www:ro
+      - ./pack:/srv/pack:ro
+      - ./mirror/launcher:/srv/www/launcher:ro
+    networks:
+      mcnet:
+        aliases:
+          - "auth.${BASE_DOMAIN}"
+          - "packwiz.${BASE_DOMAIN}"
+
   drasl:
     image: unmojang/drasl:latest
     container_name: drasl