feat(input): add codex automation stack

input/Docker/Dockerfile

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+FROM node:20-bookworm
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PUID=1000 \
+    PGID=1000 \
+    CODEX_HOME=/home/codex
+
+RUN apt-get update \
+    && apt-get install --yes --no-install-recommends \
+        python3 \
+        python3-venv \
+        gosu \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN npm install --location=global codex-cli || true
+
+RUN groupadd -r codex && \
+    useradd -r -m -g codex -s /bin/bash codex
+
+WORKDIR /app
+
+COPY watch_and_customize.py entrypoint.sh ./
+
+RUN chmod +x /app/watch_and_customize.py /app/entrypoint.sh
+
+ENTRYPOINT ["/app/entrypoint.sh"]