Initial scaffold for ShellMate - SSH chess TUI

Dockerfile

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+FROM python:3.11-slim
+
+# Install Stockfish
+RUN apt-get update && apt-get install -y \
+    stockfish \
+    openssh-client \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Install Python dependencies
+COPY pyproject.toml .
+RUN pip install --no-cache-dir .
+
+# Copy application
+COPY src/ src/
+
+# Generate SSH host key
+RUN mkdir -p /etc/shellmate && \
+    ssh-keygen -t ed25519 -f /etc/shellmate/ssh_host_key -N ""
+
+# Run as non-root
+RUN useradd -m shellmate
+USER shellmate
+
+EXPOSE 2222
+
+CMD ["shellmate-server"]