Refactor main application structure and improve logging

- Reorganized imports in main.py for better readability and structure.
- Enhanced logging configuration and added more detailed log messages throughout the application.
- Improved error handling and response formatting in transaction import endpoints.
- Streamlined transaction processing logic for CSV and image uploads.
- Updated matching engine to enhance match results with rules and improved logging.
- Refactored tax rules engine for better clarity and maintainability.
- Cleaned up requirements.txt by removing specific versioning for easier dependency management.

requirements.txt

@@ -1,16 +1,16 @@
-groq>=0.5.0
-python-dotenv==1.0.0
-pandas==2.1.4
-numpy==1.24.3
-fastapi==0.104.1
-uvicorn==0.24.0
-pydantic==2.5.0
-requests==2.31.0
-python-multipart==0.0.6
-Pillow==10.0.1
-PyPDF2==3.0.1
-aiofiles==23.2.1
-google-auth==2.23.4
-google-auth-oauthlib==1.1.0
-google-auth-httplib2==0.1.1
-google-api-python-client==2.108.0 
+groq
+python-dotenv
+pandas
+numpy
+fastapi
+uvicorn
+pydantic
+requests
+python-multipart
+Pillow
+PyPDF2
+aiofiles
+google-auth
+google-auth-oauthlib
+google-auth-httplib2
+google-api-python-client