feat: add api security foundation

Tiku.Api/Middleware/CurrentPrincipalMiddleware.cs

@@ -0,0 +1,16 @@
+using Tiku.Application.Security;
+
+namespace Tiku.Api.Middleware;
+
+public sealed class CurrentPrincipalMiddleware(RequestDelegate next)
+{
+    public async Task InvokeAsync(
+        HttpContext context,
+        ICurrentUser currentUser,
+        ICurrentTenant currentTenant)
+    {
+        currentUser.Load(context.User);
+        currentTenant.Load(context.User);
+        await next(context);
+    }
+}