refactor(restic): split each command into its own file
refactor: add missing await before promise expects
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
## Release Notes
* **Tests**
* Improved async assertion handling across test suites for enhanced test reliability
* Expanded test coverage for backup, restore, and other core operations
* **Refactor**
* Reorganized internal utility structure for improved code maintainability
* **Chores**
* Updated linting configuration and TypeScript dependencies
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
