Add Dockerfile for Python application setup

Dockerfile

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+FROM python:3.12-slim
+
+# Prevents python from writing .pyc files and buffers
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
+
+WORKDIR /app
+
+# System deps (kept minimal). sqlite3 CLI is optional, but handy for debugging DB files.
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends ca-certificates sqlite3 \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install python deps
+# meshcore is required per README
+RUN pip install --no-cache-dir --upgrade pip \
+    && pip install --no-cache-dir meshcore
+
+# Copy app
+COPY meshcore_multitcp.py meshcore_multitcp_packets.py ./ 
+COPY entrypoint.sh /entrypoint.sh
+
+# Create a non-root user
+RUN useradd -r -u 10001 -g users appuser \
+    && chown -R appuser:users /app \
+    && chmod +x /entrypoint.sh
+
+USER appuser
+
+# Default ports from your script
+EXPOSE 5000 5001
+
+# SQLite DB lives in /data so it can be mounted as a volume
+VOLUME ["/data"]
+
+# Default envs (override at runtime)
+ENV SERVER_ADDR="0.0.0.0:5000" \
+    FORWARD_ADDR="0.0.0.0:5001" \
+    DEVICE_ADDR="192.168.5.62:5000" \
+    LOG_LEVEL="info" \
+    SQLITE="false" \
+    ENABLE_FORWARD="false"
+
+ENTRYPOINT ["/entrypoint.sh"]