feat(mcp): add ComfyUI MCP server image

[ductiletoaster]

Summary

Adds a standalone Docker image for joenorton/comfyui-mcp-server — an HTTP MCP server that bridges AI agents to ComfyUI via the Model Context Protocol.

What's included

• services/mcp/dockerfile.comfy.mcp — standalone Python 3.12 image (not runtime-based); clones comfyui-mcp-server@v1.1.1 and patches the FastMCP constructor to bind 0.0.0.0 (required for container networking — upstream defaults to 127.0.0.1)
• docker-bake.hcl — new mcp target + mcp group; added to the all group
• .github/workflows/ci.yml — test-bake-targets validates the mcp target

Image details

Property	Value
Base	python:3.12-slim
Upstream	joenorton/comfyui-mcp-server@v1.1.1 (Apache-2.0)
Port	9000
Transport	Streamable HTTP (/mcp)
Published as	ghcr.io/pixeloven/comfyui/mcp:latest

Usage

# Kubernetes deployment env
- name: COMFYUI_URL
  value: "http://comfyui.comfyui.svc.cluster.local:8188"

# Local test
docker run --rm -p 9000:9000 -e COMFYUI_URL=http://host.docker.internal:8188 \
  ghcr.io/pixeloven/comfyui/mcp:latest

Source patch note

The upstream server.py calls FastMCP("...", port=9000) which defaults host="127.0.0.1". FastMCP passes this as an explicit kwarg to its pydantic-settings Settings, meaning the FASTMCP_HOST env var is ignored. A one-line sed patch changes port=9000, → port=9000, host="0.0.0.0", in the Dockerfile — zero Harmony application logic.

This was validated end-to-end in ductiletoaster/harmony before creating this PR (deployed to Kubernetes, confirmed Uvicorn running on http://0.0.0.0:9000).

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