fix(nanoclaude): docker CLI + socket 마운트로 로컬 docker 접근

INFRA_LOCAL_HOST=gpu에서 run_local("docker ps")가 동작하려면
컨테이너 안에 docker CLI + socket 필요.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

nanoclaude/Dockerfile

@@ -1,7 +1,7 @@
 FROM python:3.12-slim
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    curl openssh-client \
+    curl openssh-client docker.io \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app