Flag-Enum implementiert und IServiceMessage mit Flag-Unterstützung aktualisiert

- Flag-Enum mit Null und SecurityBreach definiert.
- Flag-Eigenschaft und HasFlag-Methode zu IServiceMessage hinzugefügt.

DigitalData.Core.Contracts/Application/IServiceMessage.cs

@@ -1,7 +1,7 @@
 using System.Text.Json.Serialization;
 
 namespace DigitalData.Core.Contracts.Application
-{
+{ 
     /// <summary>
     /// Defines a structured format for service messages, categorizing them into success indicators and various types of messages.
     /// This interface segregates messages into client-facing messages and different levels of logging messages, facilitating targeted communications and diagnostics.
@@ -14,6 +14,21 @@ namespace DigitalData.Core.Contracts.Application
         /// </summary>
         bool IsSuccess { get; set; }
 
+        /// <summary>
+        /// Gets or sets the flag that indicates the specific status type of the service operation.
+        /// This flag helps in categorizing the state of the operation more granularly.
+        /// </summary>
+        [JsonIgnore]
+        Enum Flag { get; set; }
+
+        /// <summary>
+        /// Checks if the current service message's flag matches the specified flag.
+        /// This method is useful for conditional logic based on the status of the operation.
+        /// </summary>
+        /// <param name="flag">The flag to check against the current service message's flag.</param>
+        /// <returns>true if the flags match; otherwise, false.</returns>
+        public bool HasFlag(Enum flag) => Flag.ToString() == flag.ToString();
+
         /// <summary>
         /// [Obsolete("Deprecated: Use ClientMessages instead.")]
         /// Gets a collection of messages associated with the service operation. These messages can be error descriptions,