feat: add backend for multiplayer support

frontend/Dockerfile

@@ -0,0 +1,27 @@
+FROM python:3.12-slim
+
+# Install build dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Set working directory
+WORKDIR /app
+
+# Copy project files
+COPY . .
+
+# Install PyYAML and websockets into __pypackages__/3.12/lib
+RUN mkdir -p __pypackages__/3.12/lib && \
+    PYTHONPATH=__pypackages__/3.12/lib \
+    pip install --no-cache-dir --target=__pypackages__/3.12/lib \
+    PyYAML==6.0.2 websockets==15.0.1
+
+# Build the web version
+RUN pygbag --build main.py
+
+# Expose the desired port
+EXPOSE 3010
+
+# Serve the build output
+WORKDIR /app/build/web
+CMD ["python", "-m", "http.server", "3010"]