case 4690 - CA2022: read the PE header with ReadAtLeast for the licence build date

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/AyaNova/util/FileUtil.cs

@@ -872,7 +872,9 @@ namespace AyaNova.Util
 
             using (var file = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
             {
-                file.Read(bytes, 0, bytes.Length);
+                //CA2022: a single Read may return fewer bytes than asked for, this keeps reading until full or end of file and never throws
+                //(used for the licence build date check so a short read must not become an exception)
+                file.ReadAtLeast(bytes, bytes.Length, throwOnEndOfStream: false);
             }
 
             var headerPos = BitConverter.ToInt32(bytes, peHeaderOffset);