add reference to File Service and some Constants for File Supporting in Messages ...

Constants/XAiServiceConstants.cs

@@ -0,0 +1,16 @@
+namespace xAiService.Constants
+{
+    public struct XAiServiceConstants
+    {
+        //
+        // Service Extensions Log Tag ...
+        public const string XAiServiceDILogTag = "XAiService";
+        
+        //
+        // File Provider Identifiers ...
+        public const string XAiProjectFilesIdentifier = "AiPrjF";
+        public const string XAiMessageFilesIdentifier = "AiMsgF";
+        public const string XMetaDataFileIdsIdentifier = "FileIds";
+        public const string XAiConversationFilesIdentifier = "AiCnvrF";
+    }
+}

xAiService.csproj

@@ -26,6 +26,7 @@
   <!-- Local Projects -->
   <ItemGroup>
     <ProjectReference Include="..\xAiModels\xAiModels.csproj" />
+    <ProjectReference Include="..\xFileService\xFileService.csproj" />
   </ItemGroup>
 
   <!-- Local Modules -->