Update Dockerfile

Dockerfile

@@ -1,3 +1,4 @@
+# Use Python 3.12 slim
 FROM python:3.12-slim
 
 # Install system dependencies
@@ -28,7 +29,7 @@ RUN if [ -d /app/engine/src ]; then BUILD_DIR=/app/engine/src; \
     elif [ -d /app/src ]; then BUILD_DIR=/app/src; \
     else echo "Engine source dir not found"; exit 1; fi && \
     cd "$BUILD_DIR" && \
-    make -j$(nproc) ARCH=x86-64-modern && \
+    make -j$(nproc) build ARCH=x86-64-sse41-popcnt && \
     mkdir -p /app/engine_bin && \
     cp stockfish /app/engine_bin/deepcastle && \
     chmod +x /app/engine_bin/deepcastle
@@ -53,7 +54,11 @@ RUN chmod -R 777 /app/engine_bin
 # ============================================================
 # BACKEND SETUP
 # ============================================================
-RUN pip install --no-cache-dir fastapi uvicorn chess==1.11.2 pydantic
+RUN if [ -f /app/server/requirements.txt ]; then \
+      pip install --no-cache-dir -r /app/server/requirements.txt; \
+    else \
+      pip install --no-cache-dir fastapi "uvicorn[standard]" websockets python-chess pydantic; \
+    fi
 
 # Explicit Paths
 ENV ENGINE_PATH=/app/engine_bin/deepcastle