Add Docker image for scrape mode

.dockerignore

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+.git
+.github
+.venv
+__pycache__
+*.pyc
+.pytest_cache
+scraped_data
+decaffeinator
+docs
+examples
+tests
+.env
+capsolver.key
+proxies.txt
+auth_creds.json
+sessions

Dockerfile

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+# WebVac — asyncio dynamic web scraper (scrape/crawl mode).
+#
+# Build:  docker build -t webvac .
+# Doctor: docker run --rm webvac --doctor
+# Scrape: docker run --rm -v webvac-data:/data webvac --url https://example.com --mode single
+#
+# Scan output is written under /data/scraped_data (the working directory),
+# so mount a volume at /data to keep it. The optional De-Caffeinator VAPT
+# task is not included: it needs the decaffeinator submodule and Node.js,
+# which are deliberately left out to keep this image lean.
+FROM python:3.12-slim
+
+ENV PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
+WORKDIR /app
+
+# Install the package first (README is referenced by pyproject metadata).
+COPY pyproject.toml README.md ./
+COPY webvac ./webvac
+COPY run.py ./
+
+RUN pip install --upgrade pip \
+    && pip install . \
+    && python -m patchright install --with-deps chromium
+
+# Runtime working directory: scraped_data/ lands here.
+RUN mkdir -p /data
+WORKDIR /data
+
+ENTRYPOINT ["webvac"]
+CMD ["--help"]