Initial release — Growatt SPF TCP proxy with decoder and HA MQTT integration

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

Dockerfile

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+FROM python:3.12-slim
+WORKDIR /app
+RUN pip install --no-cache-dir aiohttp paho-mqtt
+COPY proxy.py .
+COPY ha_mqtt.py .
+COPY templates/ templates/
+CMD ["python", "-u", "proxy.py"]