Fix Docker build: Use headless OpenCV

Dockerfile

@@ -7,11 +7,6 @@ ENV PYTHONUNBUFFERED=1
 ENV PORT=7860
 ENV DEBIAN_FRONTEND=noninteractive
 
-# Install system dependencies for OpenCV and DICOM processing
-RUN apt-get update && apt-get install -y \
-    libgl1-mesa-glx \
-    libglib2.0-0 \
-    && rm -rf /var/lib/apt/lists/*
 
 # Set work directory
 WORKDIR /app