Add JWT authentication and refactor namespaces
Introduced JWT-based authentication and authorization:
- Configured JWT authentication in
Program.cs with token validation.
- Added
[Authorize] attribute to a new getstring endpoint.
Refactored namespaces for consistency:
- Updated namespaces from
iknow_api.Core.* to iknow_api.*.
Enhanced middleware and dependency injection:
- Registered
IAuthService and IUserRepository.
- Added
app.UseAuthentication() and app.UseAuthorization().
Removed unused code and dependencies:
- Deleted
WeatherForecast class.
- Cleaned up redundant imports.
Updated project dependencies to include JWT authentication library.
