Update validators to use IsInEnum for Entity property

Refactored DeleteObjectProcedureValidator, InsertObjectProcedureValidator, and UpdateObjectProcedureValidator to use .IsInEnum() for validating the Entity property. This replaces custom or hardcoded checks with enum-based validation, improving consistency, maintainability, and robustness across all validators.

src/ReC.Application/Common/Validations/DeleteObjectProcedureValidator.cs

@@ -7,6 +7,10 @@ public class DeleteObjectProcedureValidator : AbstractValidator<DeleteObjectProc
 {
     public DeleteObjectProcedureValidator()
     {
+        RuleFor(x => x.Entity)
+            .IsInEnum()
+            .WithMessage("ENTITY must be a valid EntityType value.");
+
         RuleFor(x => x.Start)
             .GreaterThan(0)
             .WithMessage("Start GUID/ID must be greater than 0.");

src/ReC.Application/Common/Validations/InsertObjectProcedureValidator.cs

@@ -7,11 +7,9 @@ public class InsertObjectProcedureValidator : AbstractValidator<InsertObjectProc
 {
     public InsertObjectProcedureValidator()
     {
-        // ENTITY must be one of the allowed values
         RuleFor(x => x.Entity)
-            .NotEmpty()
+            .IsInEnum()
-            .Must(e => e is "ACTION" or "ENDPOINT" or "ENDPOINT_AUTH" or "ENDPOINT_PARAMS" or "PROFILE" or "RESULT")
+            .WithMessage("ENTITY must be a valid EntityType value.");
-            .WithMessage("ENTITY must be one of: ACTION, ENDPOINT, ENDPOINT_AUTH, ENDPOINT_PARAMS, PROFILE, RESULT.");
 
         // ACTION validation
         When(x => x.Action != null, () =>

src/ReC.Application/Common/Validations/UpdateObjectProcedureValidator.cs

@@ -7,6 +7,10 @@ public class UpdateObjectProcedureValidator : AbstractValidator<UpdateObjectProc
 {
     public UpdateObjectProcedureValidator()
     {
+        RuleFor(x => x.Entity)
+            .IsInEnum()
+            .WithMessage("ENTITY must be a valid EntityType value.");
+
         RuleFor(x => x.Id)
             .GreaterThan(0)
             .WithMessage("Target GUID/ID must be greater than 0.");