API docs et Dockerfile for dev

support/docker-dev/Dockerfile

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+FROM python:3.9.2-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+# Install minimal build deps (kept small). Adjust if your requirements need additional system packages.
+RUN sed -i 's|http://deb.debian.org/debian|http://archive.debian.org/debian|g' /etc/apt/sources.list \
+    || true \
+    && sed -i 's|http://security.debian.org/debian-security|http://archive.debian.org/debian-security|g' /etc/apt/sources.list \
+    || true \
+    && echo 'Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/99no-check-valid-until \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends gcc ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Copy only requirements first to leverage Docker cache
+COPY requirements.txt /app/requirements.txt
+
+RUN pip install --upgrade pip \
+    && pip install --no-cache-dir -r /app/requirements.txt
+
+# By default the container runs Python; pass a script name or `-m` args after the image name.
+ENTRYPOINT ["python3"]
+
+# Recommended working directory for runs
+CMD ["-V"]