Fix: Add system dependencies for OpenCV

Dockerfile

@@ -1,6 +1,13 @@
 # Use a standard Python 3.10 image
 FROM python:3.10-slim
 
+# --- ADD THIS BLOCK ---
+# Install system dependencies for OpenCV (which doctr needs)
+RUN apt-get update && apt-get install -y libgl1-mesa-glx && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+# --- END OF BLOCK ---
+
 # Set the working directory inside the container
 WORKDIR /code
 
@@ -14,5 +21,6 @@ COPY . .
 # Expose the port your app will run on
 EXPOSE 7860
 
-# The command to run your app (using uvicorn)
+# The command to run your app
+# This is the same command you used locally!
 CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]