Fix npm registry ARG so builds use npmmirror by default

ARG after FROM was empty without an explicit default, so npm ci hit the slow/blocked official registry.

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.yml

@@ -21,6 +21,8 @@ services:
     build:
       context: .
       dockerfile: Dockerfile
+      args:
+        NPM_REGISTRY: ${NPM_REGISTRY:-https://registry.npmmirror.com}
     container_name: fabric_trade_api
     restart: unless-stopped
     depends_on: