feat(ebook): add Docker packaging and lifecycle tooling

Add a self-contained docker/ package for running the ebook search app
against the existing Postgres database on jeeves:

- Dockerfile: python:3.14-slim image, non-root user, runs the FastAPI
  app on port 8070
- docker-compose.yml: service definition with library volume mount,
  BM25 index volume, .env loading, and a /health healthcheck
- containers.py: Typer CLI (ebook-search-containers) for build/start/
  stop/restart/logs/ps lifecycle management
- README.md: usage and configuration docs

python/ebook_search/docker/Dockerfile

@@ -0,0 +1,49 @@
+FROM python:3.14-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1 \
+    APP_DIR=/home/richie/dotfiles \
+    EBOOK_SEARCH_HOST=0.0.0.0 \
+    EBOOK_SEARCH_PORT=8070 \
+    EBOOK_SEARCH_BM25_INDEX_DIR=/data/bm25
+
+WORKDIR ${APP_DIR}
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends build-essential curl \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY pyproject.toml README.md LICENSE ./
+COPY python ./python
+
+RUN python -m pip install --upgrade pip \
+    && python -m pip install \
+        "alembic" \
+        "beautifulsoup4" \
+        "bm25s" \
+        "ebooklib" \
+        "fastapi" \
+        "httpx" \
+        "jinja2" \
+        "pgvector" \
+        "psycopg[binary]" \
+        "pydantic" \
+        "pydantic-settings" \
+        "python-multipart" \
+        "sqlalchemy" \
+        "tiktoken" \
+        "typer" \
+        "uvicorn[standard]" \
+        "yake" \
+    && python -m pip install --no-deps --editable "${APP_DIR}"
+
+RUN useradd --create-home --uid 10001 app \
+    && mkdir -p /data \
+    && chown -R app:app /home/richie /data
+
+USER app
+
+EXPOSE 8070
+
+CMD ["sh", "-c", "exec python -m python.ebook_search.api.main --host \"${EBOOK_SEARCH_HOST}\" --port \"${EBOOK_SEARCH_PORT}\" --log-level \"${EBOOK_SEARCH_LOG_LEVEL:-INFO}\""]