feat(saas): implement marketplace and tenant onboarding

Tiku.Api/Configuration/ApplicationBuilderExtensions.cs

@@ -3,6 +3,7 @@ using Serilog;
 using Tiku.Api.Logging;
 using Tiku.Api.Middleware;
 using Tiku.Api.Options;
+using Tiku.Api.Security;
 
 namespace Tiku.Api.Configuration;
 
@@ -35,6 +36,7 @@ public static class ApplicationBuilderExtensions
         app.UseRateLimiter();
         app.UseMiddleware<CurrentPrincipalMiddleware>();
         app.UseAuthorization();
+        app.UseMiddleware<SaasFeatureAccessMiddleware>();
         app.MapControllers();
 
         return app;