fix(nanoclaude): docker CLI static binary 설치

docker.io 패키지가 slim 이미지에서 안 됨.
Docker static binary 직접 다운로드로 교체.

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

nanoclaude/Dockerfile

@@ -1,8 +1,10 @@
 FROM python:3.12-slim
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    curl openssh-client docker.io \
+    curl openssh-client \
-    && rm -rf /var/lib/apt/lists/*
+    && rm -rf /var/lib/apt/lists/* \
+    && curl -fsSL https://download.docker.com/linux/static/stable/x86_64/docker-27.5.1.tgz \
+    | tar xz --strip-components=1 -C /usr/local/bin docker/docker
 
 WORKDIR /app