Most services are implemented as command/queries

Code cleanup

ModernKeePass.Application/Recent/Queries/HasRecent/HasRecentQuery.cs

@@ -0,0 +1,23 @@
+using MediatR;
+using ModernKeePass.Application.Common.Interfaces;
+
+namespace ModernKeePass.Application.Recent.Queries.HasRecent
+{
+    public class HasRecentQuery : IRequest<bool>
+    {
+        public class HasRecentQueryHandler : IRequestHandler<HasRecentQuery, bool>
+        {
+            private readonly IRecentProxy _recent;
+
+            public HasRecentQueryHandler(IRecentProxy recent)
+            {
+                _recent = recent;
+            }
+
+            public bool Handle(HasRecentQuery message)
+            {
+                return _recent.EntryCount > 0;
+            }
+        }
+    }
+}