New MQTT adaption

Dockerfile

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+FROM python:3.11-slim
+
+# Set metadata
+LABEL maintainer="mail@hendrikschutter.com"
+LABEL description="Prometheus exporter for VEGAPULS Air sensors via The Things Network"
+LABEL version="2.0"
+
+# Create app directory
+WORKDIR /app
+
+# Install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application files
+COPY ttn-vegapuls-exporter.py .
+COPY config.py .
+
+# Create non-root user
+RUN useradd -r -u 1000 -g users exporter && \
+    chown -R exporter:users /app
+
+# Switch to non-root user
+USER exporter
+
+# Expose metrics port
+EXPOSE 9106
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
+    CMD python -c 'import urllib.request; urllib.request.urlopen("http://localhost:9106/health")' || exit 1
+
+# Set environment variables
+ENV PYTHONUNBUFFERED=1
+
+# Run the exporter
+CMD ["python", "ttn-vegapuls-exporter.py"]