feat: promote linux native audio path

apps/chanora_flutter/lib/services/app_bootstrap.dart

@@ -18,17 +18,19 @@ Future<void>? _storageInitFuture;
 Future<void>? _vadBootstrapFuture;
 StorageDirectoryProvider _storageDirectoryProvider =
     getApplicationSupportDirectory;
+StorageDirectoryProvider _vadModelDirectoryProvider =
+    getApplicationSupportDirectory;
 StorageInitializer _storageInitializer = _defaultStorageInitializer;
 
 Future<void> _defaultStorageInitializer(String dir) {
   return rust.initStorage(dir: dir);
 }
 
-Future<File> _copyBundledAssetToDocuments({
+Future<File> _copyBundledAssetToManagedDirectory({
   required String assetPath,
   required String fileName,
 }) async {
-  final dir = await getApplicationDocumentsDirectory();
+  final dir = await _vadModelDirectoryProvider();
   final file = File('${dir.path}/$fileName');
   final data = await rootBundle.load(assetPath);
   final bytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
@@ -59,7 +61,7 @@ Future<void> configureBundledVadModels() async {
 }
 
 Future<void> _configureBundledVadModelsImpl() async {
-  final silero = await _copyBundledAssetToDocuments(
+  final silero = await _copyBundledAssetToManagedDirectory(
     assetPath: _sileroVadAsset,
     fileName: 'silero_vad.onnx',
   );
@@ -124,12 +126,15 @@ Future<void> _wireStorageImpl() async {
 @visibleForTesting
 void debugResetStorageBootstrap({
   StorageDirectoryProvider? storageDirectoryProvider,
+  StorageDirectoryProvider? vadModelDirectoryProvider,
   StorageInitializer? storageInitializer,
 }) {
   _storageInitFuture = null;
   _vadBootstrapFuture = null;
   _storageDirectoryProvider =
       storageDirectoryProvider ?? getApplicationSupportDirectory;
+  _vadModelDirectoryProvider =
+      vadModelDirectoryProvider ?? getApplicationSupportDirectory;
   _storageInitializer = storageInitializer ?? _defaultStorageInitializer;
 }