Add deployment scaffolding (Dockerfile, docker-compose, nginx)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.prod.yml

@@ -0,0 +1,22 @@
+version: '3.8'
+
+services:
+  backend:
+    volumes:
+      - /opt/mycopunk-swag/designs:/app/designs
+      - /opt/mycopunk-swag/config:/app/config:ro
+    environment:
+      - DESIGNS_PATH=/app/designs
+      - CONFIG_PATH=/app/config
+
+  frontend:
+    build:
+      args:
+        - NEXT_PUBLIC_API_URL=https://swag.mycofi.earth/api
+
+networks:
+  swag-internal:
+    driver: bridge
+    ipam:
+      config:
+        - subnet: 10.200.0.0/24