fix(sync): ignore AddOns subfolders to make sure we do not overwrite user's addons

lib/features/launcher/data/game_installation_service.dart

@@ -8,10 +8,11 @@ import 'package:injectable/injectable.dart';
 import 'package:moonwell_launcher/config.dart';
 import 'package:moonwell_launcher/features/downloader/domain/entities/download_exceptions.dart';
 import 'package:moonwell_launcher/features/downloader/domain/entities/download_progress.dart';
+import 'package:moonwell_launcher/features/launcher/domain/entities/client_hash_entry.dart';
 import 'package:moonwell_launcher/features/launcher/domain/entities/client_installation_snapshot.dart';
+import 'package:moonwell_launcher/features/launcher/domain/entities/client_manifest.dart';
 import 'package:moonwell_launcher/features/launcher/domain/entities/launcher_exception.dart';
 import 'package:moonwell_launcher/features/launcher/domain/entities/local_client_file.dart';
-import 'package:moonwell_launcher/features/launcher/domain/entities/client_hash_entry.dart';
 import 'package:path/path.dart' as p;
 
 typedef InstallationScanProgressCallback =
@@ -33,6 +34,7 @@ final class GameProcessHandle {
 class GameInstallationService {
   Future<ClientInstallationSnapshot> scanInstallation(
     String installationDir, {
+    required ClientManifest manifest,
     InstallationScanProgressCallback? onProgress,
     FutureOr<bool> Function()? isCancelled,
   }) async {
@@ -132,6 +134,7 @@ class GameInstallationService {
         'hashCachePath': hashCachePath,
         'cachedHashes': cachedHashes,
         'ignoredDirectories': Config.ignoredVerificationDirectories.toList(),
+        'serverFiles': manifest.files.map((f) => f.path).toList(),
       },
       onError: errorPort.sendPort,
       onExit: exitPort.sendPort,
@@ -343,6 +346,9 @@ Future<void> _scanInstallationIsolateMain(Map<String, Object?> message) async {
       .whereType<String>()
       .map((entry) => entry.toLowerCase())
       .toSet();
+  final serverFiles = (message['serverFiles'] as List<Object?>)
+      .whereType<String>()
+      .toSet();
 
   final rootDirectory = Directory(installationDir);
   if (!await rootDirectory.exists()) {
@@ -356,6 +362,7 @@ Future<void> _scanInstallationIsolateMain(Map<String, Object?> message) async {
     rootDirectory.path,
     pendingFiles,
     ignoredDirectories,
+    serverFiles,
   );
 
   pendingFiles.sort(
@@ -424,41 +431,21 @@ Future<void> _collectFilesInIsolate(
   String rootPath,
   List<_SerializablePendingFile> pendingFiles,
   Set<String> ignoredDirectories,
+  Set<String> serverFiles,
 ) async {
-  await for (final entity in directory.list(followLinks: false)) {
-    final relativePath = normalizeClientPath(
-      p.relative(entity.path, from: rootPath),
-    );
+  for (final path in serverFiles) {
+    final file = File('$rootPath/$path');
 
-    if (relativePath.isEmpty || relativePath == '.') {
+    if (!await file.exists()) {
       continue;
     }
 
-    final segments = p.posix.split(relativePath);
-    if (segments.isNotEmpty &&
-        ignoredDirectories.contains(segments.first.toLowerCase())) {
-      continue;
-    }
+    final stat = await file.stat();
 
-    if (entity is Directory) {
-      await _collectFilesInIsolate(
-        entity,
-        rootPath,
-        pendingFiles,
-        ignoredDirectories,
-      );
-      continue;
-    }
-
-    if (entity is! File) {
-      continue;
-    }
-
-    final stat = await entity.stat();
     pendingFiles.add(
       _SerializablePendingFile(
-        path: entity.path,
-        relativePath: relativePath,
+        path: file.path,
+        relativePath: normalizeClientPath(p.relative(path)),
         size: stat.size,
         modifiedMs: stat.modified.millisecondsSinceEpoch,
       ),