Fix package name for newer Debian

Dockerfile

@@ -2,7 +2,7 @@ FROM python:3.11-slim
 
 # Install system dependencies required for OpenCV and pyzbar (barcodes)
 RUN apt-get update && apt-get install -y \
-    libgl1-mesa-glx \
+    libgl1 \
     libglib2.0-0 \
     libzbar0 \
     && rm -rf /var/lib/apt/lists/*
@@ -12,7 +12,6 @@ WORKDIR /app
 # Copy requirements and install
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
-# Install uvicorn and fastapi explicitly to ensure they are available in container
 RUN pip install --no-cache-dir fastapi uvicorn python-multipart
 
 # Copy all project files
@@ -25,4 +24,4 @@ RUN mkdir -p temp_uploads results images/barcode images/chassis
 EXPOSE 8000
 
 # Start application
-CMD ["uvicorn", "server:app", "--host", "0.0.0.0", "--port", "8000"]
+CMD ["uvicorn", "server:app", "--host", "0.0.0.0", "--port", "8000"]