feat: ComfyUI embedded dev setup + proxy auth with downstream keys

- COMFYUI_BASE configurable via env var (default 127.0.0.1:8188)
- All /api/comfyui/ routes protected by downstream API Key or admin token
- docker/Dockerfile.comfyui + docker-compose.comfyui.yml for dev
- npm scripts: comfyui:install, comfyui:start, comfyui:stop
- .gitignore / .env.example updated

docker/docker-compose.comfyui.yml

@@ -0,0 +1,22 @@
+# docker-compose.comfyui.yml
+# 开发环境：在 BoosAPI 旁边运行 ComfyUI
+# 使用: docker compose -f docker/docker-compose.yml -f docker/docker-compose.comfyui.yml up -d
+services:
+  comfyui:
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile.comfyui
+    ports:
+      - "127.0.0.1:8188:8188"
+    volumes:
+      - comfyui-data:/workspace
+      - ../boosapi_comfy_nodes.py:/workspace/ComfyUI/custom_nodes/boosapi_comfy_nodes.py
+    environment:
+      - BOOSAPI_BASE=http://host.docker.internal:4000/v1
+      - BOOSAPI_KEY=${BOOSAPI_KEY:-sk-demo-user}
+    restart: unless-stopped
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+
+volumes:
+  comfyui-data: