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/Dockerfile.comfyui

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+FROM python:3.11-slim
+
+WORKDIR /workspace
+
+# Install system deps
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Clone ComfyUI
+RUN git clone https://github.com/comfyanonymous/ComfyUI.git /workspace/ComfyUI
+
+WORKDIR /workspace/ComfyUI
+
+# Python venv + deps (CPU-only, generation goes through BoosAPI)
+RUN python3 -m venv venv && \
+    . venv/bin/activate && \
+    pip install --upgrade pip && \
+    pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cpu && \
+    grep -v kornia_rs requirements.txt | pip install -r /dev/stdin && \
+    rm -rf ~/.cache/pip
+
+ENV PATH="/workspace/ComfyUI/venv/bin:${PATH}"
+
+EXPOSE 8188
+
+CMD ["python3", "main.py", "--listen", "0.0.0.0", "--port", "8188", "--cpu"]

docker/docker-compose.comfyui.yml

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+# 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: