feat: add Containerfile and podman-compose setup

Host network mode for direct access to SOCKS5 proxy on localhost.
Config volume mounted from ./config. Makefile targets: build, up,
down, logs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Containerfile

@@ -0,0 +1,13 @@
+FROM python:3.12-slim
+
+WORKDIR /app
+
+COPY pyproject.toml .
+COPY src/ src/
+
+RUN pip install --no-cache-dir .
+
+VOLUME /data
+
+ENTRYPOINT ["bouncer"]
+CMD ["-c", "/data/bouncer.toml"]