Restore backend files and ensure Dockerfile is in root

Dockerfile

@@ -0,0 +1,42 @@
+# Use an official Python Alpine runtime as a parent image for smaller size
+FROM python:3.13-alpine
+
+# Set the working directory in the container
+# All subsequent commands (COPY, RUN, CMD) use this path
+WORKDIR /app
+
+# Install system dependencies that might be needed by Python packages on Alpine
+# Example for PyMuPDF: RUN apk add --no-cache musl-dev freetype-dev harfbuzz-dev jpeg-dev openjpeg-dev zlib-dev tiff-dev lcms2-dev
+# RUN apk add --no-cache some-alpine-package
+
+# Copy only the requirements file first to leverage Docker cache
+COPY backend/requirements.txt /app/requirements.txt
+
+# Install Python dependencies
+RUN pip install --no-cache-dir --upgrade pip
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the application code into the container
+# This includes the backend directory, templates, static files etc.
+# Adjust the source paths based on your project structure relative to the Dockerfile location
+COPY backend/ /app/backend
+COPY templates/ /app/templates
+COPY static/ /app/static
+# We don't copy uploads dir, it will be created by the app if needed
+
+# Create the necessary directories within the container that the app expects
+# Although the app tries to create them, it's good practice for Dockerfile to ensure they exist
+RUN mkdir -p /app/templates /app/static /app/uploads
+
+# Make port 8000 available to the world outside this container
+# Hugging Face Spaces often map to this port from the outside world (port 7860 is also common)
+EXPOSE 8000
+
+# Define environment variable (optional)
+# ENV NAME World
+
+# Run main.py using uvicorn when the container launches
+# The command needs to specify the location of the app module (backend.main:app)
+# Host 0.0.0.0 makes it accessible from outside the container
+# Add --reload flag for development if needed, but remove for production
+CMD ["uvicorn", "backend.main:app", "--host", "0.0.0.0", "--port", "8000"]

README.md

@@ -4,6 +4,7 @@ emoji: 📊
 colorFrom: pink
 colorTo: purple
 sdk: docker
+app_port: 8000 # Added required port for Docker SDK
 pinned: false
 ---