Update Dockerfile

Dockerfile

@@ -31,7 +31,7 @@ RUN echo "Cloning fresh engine source..." && \
     git clone --depth 1 https://github.com/official-stockfish/Stockfish.git /app/clean_engine
 
 WORKDIR /app/clean_engine/src
-RUN make -j$(nproc) build ARCH=x86-64-sse41-popcnt && \
+RUN make -j$(nproc) build ARCH=x86-64-modern && \
     mkdir -p /app/engine && \
     cp stockfish /app/engine/deepcastle && \
     chmod +x /app/engine/deepcastle
@@ -62,7 +62,7 @@ RUN if [ ! -f "nn-9a0cc2a62c52.nnue" ]; then wget https://tests.stockfishchess.o
 # BACKEND SETUP
 # ============================================================
 WORKDIR /app
-RUN pip install --no-cache-dir fastapi uvicorn python-chess pydantic
+RUN pip install --no-cache-dir fastapi uvicorn python-chess pydantic websockets
 
 # Set PYTHONPATH to include all potential source directories
 ENV PYTHONPATH="/app:/app/server"