Replace emoji icons with plain text/ASCII equivalents to prevent
encoding issues and improve console compatibility:
- Replace checkmarks with *
- Replace x marks with x
- Replace status indicators with text [OK], [ERR], etc.
- Remove decorative emojis from info/debug log messages
- Keep functional emojis in user-facing chat/sentiment features
- Add email, teams, google columns to attendant.csv
- Add find_attendant_by_identifier() for multi-channel lookup
- Add find_attendants_by_channel() and find_attendants_by_department()
- Implement handle_status_command with database persistence
- Implement handle_transfer_command with actual transfer logic
- Update AttendantCSV struct with all new fields
The sqlx database library has been removed from the project along with
associated database-specific code that was no longer being used. This
includes removal of various sqlx-related dependencies from Cargo.lock
and cleanup of database connection pool references.
