Add Docker container setup (port 35811)

- Dockerfile: builds from Sources/ context, installs stegasoo + verisoo + soosef
- docker-compose.yml: single service with persistent volume at /root/.soosef
- entrypoint.sh: auto-init on first run, gunicorn with 2 workers

Build: cd soosef/docker && sudo docker compose build
Run:   sudo docker compose up -d

Port 35811, HTTPS disabled by default (reverse proxy expected)

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

docker/Dockerfile

@@ -0,0 +1,71 @@
+# SooSeF Docker Image
+#
+# Requires stegasoo and verisoo source directories alongside soosef:
+#   Sources/
+#   ├── stegasoo/
+#   ├── verisoo/
+#   └── soosef/     ← build context is parent (Sources/)
+#
+# Build:
+#   docker build -t soosef -f soosef/docker/Dockerfile .
+#
+# Or use docker-compose from soosef/docker/:
+#   docker compose up
+
+FROM python:3.12-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+ENV PIP_ROOT_USER_ACTION=ignore
+
+# System dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    g++ \
+    libc-dev \
+    libffi-dev \
+    libzbar0 \
+    libjpeg-dev \
+    zlib1g-dev \
+    curl \
+    openssl \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# ── Install stegasoo ─────────────────────────────────────────────
+COPY stegasoo/pyproject.toml stegasoo/pyproject.toml
+COPY stegasoo/README.md stegasoo/README.md
+COPY stegasoo/src/ stegasoo/src/
+COPY stegasoo/data/ stegasoo/data/
+COPY stegasoo/frontends/ stegasoo/frontends/
+RUN pip install --no-cache-dir /app/stegasoo[web,dct,audio,cli]
+
+# ── Install verisoo ──────────────────────────────────────────────
+COPY verisoo/pyproject.toml verisoo/pyproject.toml
+COPY verisoo/README.md verisoo/README.md
+COPY verisoo/src/ verisoo/src/
+RUN pip install --no-cache-dir /app/verisoo[cli]
+
+# ── Install soosef ───────────────────────────────────────────────
+COPY soosef/pyproject.toml soosef/pyproject.toml
+COPY soosef/README.md soosef/README.md
+COPY soosef/src/ soosef/src/
+COPY soosef/frontends/ soosef/frontends/
+RUN pip install --no-cache-dir /app/soosef[web,cli]
+
+# ── Runtime setup ────────────────────────────────────────────────
+RUN mkdir -p /root/.soosef
+
+COPY soosef/docker/entrypoint.sh /app/entrypoint.sh
+RUN chmod +x /app/entrypoint.sh
+
+ENV SOOSEF_DATA_DIR=/root/.soosef
+WORKDIR /app/soosef
+
+EXPOSE 35811
+
+HEALTHCHECK --interval=30s --timeout=10s --start-period=15s --retries=3 \
+    CMD curl -fsk https://localhost:35811/ || curl -fs http://localhost:35811/ || exit 1
+
+ENTRYPOINT ["/app/entrypoint.sh"]