Remove unused file

mobile/lib/services/remote/cache/cache.dart

@@ -1,29 +0,0 @@
-import "package:photos/models/file/remote/asset.dart";
-import "package:photos/models/file/remote/collection_file.dart";
-
-class RemoteAssetCache {
-  final Map<int, RemoteAsset> _cache = {};
-  final Map<int, Set<int>> _collectionsToAssets = {};
-  final Map<int, Set<int>> _assetsToCollections = {};
-  final Map<String, CollectionFile> _fileEntries = {};
-
-  List<int>? uncachedAssets(List<int> assetIDs) {
-    final missing = <int>[];
-    for (final id in assetIDs) {
-      if (!_cache.containsKey(id)) {
-        missing.add(id);
-      }
-    }
-    return missing.isEmpty ? null : missing;
-  }
-
-  void addOrUpdate(List<RemoteAsset> assets) {
-    for (final asset in assets) {
-      _cache[asset.id] = asset;
-    }
-  }
-
-  void clearCache() {
-    _cache.clear();
-  }
-}