Fix Dockerfile - update package names for Debian

Dockerfile

@@ -2,10 +2,13 @@ FROM python:3.11-slim
 
 WORKDIR /app
 
-# Install system dependencies
+# Install system dependencies for OpenCV
 RUN apt-get update && apt-get install -y \
-    libgl1-mesa-glx \
+    libgl1 \
     libglib2.0-0 \
+    libsm6 \
+    libxext6 \
+    libxrender-dev \
     && rm -rf /var/lib/apt/lists/*
 
 # Copy requirements first for caching
@@ -20,7 +23,7 @@ COPY static/ static/
 # Create work directories
 RUN mkdir -p work outputs
 
-# Expose port
+# Expose port (HuggingFace uses 7860)
 EXPOSE 7860
 
 # Run the app