Add OpenAI API integration and document processing features

- Added OpenAI API key configuration to .env.example.
- Integrated OpenAI for document processing, including markdown conversion and data extraction.
- Implemented new API routes for fetching document processing status and handling various processing tasks.
- Enhanced the App component to manage document status and processing states with user feedback via Snackbar.
- Updated CSVImportPanel and TableManagement components to support navigation to specific tabs based on processing results.
- Introduced transaction handling in the database configuration for improved error management during document processing.

package.json

@@ -32,6 +32,8 @@
     "google-auth-library": "^9.0.0",
     "jsonwebtoken": "^9.0.0",
     "mssql": "^9.1.0",
+    "nodemailer": "^7.0.5",
+    "openai": "^5.12.0",
     "react": "^18.2.0",
     "react-dom": "^18.2.0"
   },