This commit renames and refactors all instances of `OutgoingEmail` to `SendingEmail` across the codebase to improve terminology consistency and align with domain language.
- Renamed classes, interfaces, and records (e.g., `OutgoingEmailPublisher` → `SendingEmailPublisher`, `OutgoingEmailEvent` → `SendingEmailEvent`).
- Updated method signatures, parameters, and return types to use `SendingEmail`.
- Adjusted dependency injection registrations to reflect the new naming.
- Updated mappings in `EmailMappingProfile` to map `SendEmailCommand` to `SendingEmailEvent`.
- Refactored `SendEmailCommand` and its handler to work with `SendingEmailEvent`.
- Updated `EmailsController` to use `SendingEmailEvent` in the `SendEmail` action.
- Refactored integration tests to test `SendingEmailPublisher` and updated test data accordingly.
- Updated log messages, error handling, and comments to reflect the new terminology.
- Revised documentation and utility methods to use `SendingEmailEvent`.
This refactor ensures consistency, improves readability, and reduces ambiguity in the codebase.
- Consolidated commands and handlers into single files for better organization.
- Updated file naming conventions for commands and queries.
- Added explicit Git operation rules to prevent automatic commits/pushes.
- Introduced new projects and restructured solution file (`legacy` folder).
- Refactored `CreateEmailAccountCommand`, `ProcessEmailCommand`, and others to use `IUnitOfWork`.
- Enhanced `ProcessEmailCommandHandler` with attachment validation and error handling.
- Removed redundant handler files after consolidation.
- Improved code consistency and added `TODO` comments for future enhancements.
