Update Dockerfile: remove Python backend and old file references

- Removed Python installation (no longer needed)
- Removed backend folder copying
- Removed requirements.txt reference
- Removed start-all.sh reference
- Simplified to pure Node.js/Next.js deployment
- Added /data/sessions folder creation

Dockerfile

@@ -40,30 +40,12 @@ COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
 
 # Create data directory for file uploads (Hugging Face persistent storage)
 # Note: /data is persistent in Hugging Face Spaces
-RUN mkdir -p /data/documents /data/public /data/exams /data/files
+RUN mkdir -p /data/documents /data/public /data/exams /data/files /data/sessions
 RUN chown -R nextjs:nodejs /data
 
-# Install Python for MCP backend
-RUN apk add --no-cache python3 py3-pip
-
-# Copy Python backend
-COPY --chown=nextjs:nodejs backend /app/backend
-WORKDIR /app/backend
-
-# Install Python dependencies
-COPY requirements.txt .
-RUN pip3 install --no-cache-dir --break-system-packages -r requirements.txt
-
-WORKDIR /app
-
 # Switch to non-root user
 USER nextjs
 
-# Copy MCP server files
-COPY --from=builder --chown=nextjs:nodejs /app/mcp-server.js ./
-COPY --from=builder --chown=nextjs:nodejs /app/start-all.sh ./
-RUN chmod +x start-all.sh
-
 # Expose port 7860 for Hugging Face Spaces
 EXPOSE 7860