Update docker/Dockerfile.cpu

docker/Dockerfile.cpu

@@ -2,14 +2,15 @@
 # CPU-only Dockerfile for BackgroundFX Pro
 # For development, testing, or CPU-only deployments
 # ============================================================================
-
 FROM python:3.10-slim
 
+# Set environment variables - INCLUDING MKL_NUM_THREADS to fix libgomp error
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
     DEBIAN_FRONTEND=noninteractive \
     DEVICE=cpu \
-    OMP_NUM_THREADS=4
+    OMP_NUM_THREADS=4 \
+    MKL_NUM_THREADS=4
 
 # Install system dependencies
 RUN apt-get update && apt-get install -y --no-install-recommends \
@@ -49,4 +50,4 @@ HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
 EXPOSE 7860 8000
 
 # Launch
-CMD ["python", "-u", "app.py"]
+CMD ["python", "-u", "app.py"]