feat: add subscription auto-sync, node pools, docker deployment docs

Dockerfile

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+FROM python:3.13-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends curl unzip && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY main.py .
+COPY start.sh .
+RUN chmod +x start.sh
+
+RUN mkdir -p config data bin
+
+EXPOSE 8080
+
+HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
+  CMD curl -sf http://127.0.0.1:8080/api/links || exit 1
+
+CMD ["python", "main.py"]