fix: update Caddy Docker Compose template to use variable for Gitea network name

templates/docker-compose-caddy.yml.tpl

@@ -1,6 +1,8 @@
 # Caddy Docker Compose — rendered by phase8_cutover.sh
 # Caddy with Cloudflare DNS-01 support for wildcard TLS.
 # CF_API_TOKEN env var is only needed when TLS_MODE=cloudflare.
+# Variables: CADDY_DATA_PATH, CADDY_CONTAINER_IP, CADDY_ENV_VARS,
+#            CADDY_EXTRA_VOLUMES, GITEA_NETWORK_NAME
 
 version: "3"
 
@@ -17,9 +19,9 @@ ${CADDY_ENV_VARS}
       - ${CADDY_DATA_PATH}/config:/config
 ${CADDY_EXTRA_VOLUMES}
     networks:
-      gitea_net:
+      ${GITEA_NETWORK_NAME}:
         ipv4_address: ${CADDY_CONTAINER_IP}
 
 networks:
-  gitea_net:
+  ${GITEA_NETWORK_NAME}:
     external: true