Initial router DynDNS service

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+COPY pyproject.toml README.md /app/
+COPY router_dyndns /app/router_dyndns
+RUN pip install --no-cache-dir .
+
+EXPOSE 8080
+CMD ["router-dyndns", "serve", "--host", "0.0.0.0", "--port", "8080"]