simplify: drop Dockerfile, use upstream node:22-slim

No custom images to maintain. docker-compose mounts the repo
directly into the stock node container.

docker-compose.yml

@@ -1,20 +1,14 @@
 services:
   forge:
-    build: .
+    image: node:22-slim
     container_name: forge-console
+    working_dir: /app
+    command: >
+      sh -c "cd web && npm install --production --silent && node server.js"
     ports:
       - "3000:3000"
     env_file:
       - .env
     volumes:
-      # Mount skills and config so changes persist without rebuild
-      - ./skills:/app/skills
-      - ./config:/app/config
-      - ./bmad:/app/bmad
-      - ./.standards:/app/.standards
-      # Mount mcporter auth cache so OAuth tokens persist
-      - mcporter-auth:/root/.mcporter
+      - .:/app
     restart: unless-stopped
-
-volumes:
-  mcporter-auth: