- Replaced explicit string usage with `CreatedByRole` enum for better maintainability.
- Removed duplicate `CreatedByRole` class definition, improving codebase consistency.
- Increased file number limits from 6 to 10 to allow more file uploads.
- Transitioned `AppMode` to a string enum for consistent type usage.
- Refactored `extract_thread_messages` function argument for flexibility.
- Removed file extension limitation in file service to support custom extensions.
- Improved enum import statements across multiple modules for clarity and consistency.
-LAN-