fixed bugs related to index check and gc

ParadoxSaveParser.WebAPI/Program.RequestHandlers.cs

@@ -109,7 +109,7 @@ public partial class Program
         }
         finally
         {
-            GC.Collect(GC.MaxGeneration, GCCollectionMode.Aggressive, false, true);
+            GC.Collect(GC.MaxGeneration, GCCollectionMode.Aggressive, true, true);
         }
 
         return await ReturnResponseJson(ctx, meta);

ParadoxSaveParser.WebAPI/Program.cs

@@ -12,7 +12,6 @@ global using Directory = DTLib.Filesystem.Directory;
 global using File = DTLib.Filesystem.File;
 global using Path = DTLib.Filesystem.Path;
 using System.Collections.Concurrent;
-using System.Diagnostics;
 using System.IO;
 using System.Text.Encodings.Web;
 using DTLib.Dtsod;