feat: add Docker support with Dockerfile and docker-compose configuration

Dockerfile

@@ -0,0 +1,17 @@
+FROM python:3.13-slim
+
+WORKDIR /app
+
+# Install dependencies first (layer-cached until requirements.txt changes).
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy source — config.json and ca/ are intentionally excluded (.dockerignore)
+# and mounted at runtime so secrets are never baked into the image.
+COPY . .
+
+EXPOSE 8085 1080
+
+# --host 0.0.0.0 is required inside a container so the proxy is reachable
+# from outside. The value in config.json is ignored for the host binding.
+CMD ["python", "main.py", "--host", "0.0.0.0"]