Refactor to use VwmyCatalog as primary catalog entity

Replaced all usage of the Catalog entity with VwmyCatalog across application, domain, and infrastructure layers. Updated AutoMapper profiles, repository interfaces, and service logic to use VwmyCatalog. Removed the obsolete Catalog entity and related mapping profiles. Moved VwmyCatalog to the Domain.Entities namespace and cleaned up project structure. This change simplifies the domain model and eliminates redundant entity definitions.

DbFirst.Domain/Entities/VwmyCatalog.cs

@@ -0,0 +1,18 @@
+namespace DbFirst.Domain.Entities;
+
+public partial class VwmyCatalog
+{
+    public int Guid { get; set; }
+
+    public string CatTitle { get; set; } = null!;
+
+    public string CatString { get; set; } = null!;
+
+    public string AddedWho { get; set; } = null!;
+
+    public DateTime AddedWhen { get; set; }
+
+    public string? ChangedWho { get; set; }
+
+    public DateTime? ChangedWhen { get; set; }
+}