Define a dummy init method

lib/services/semantic_search/embedding_service.dart

@@ -1,4 +1,5 @@
 abstract class EmbeddingService {
+  Future<void> init();
   Future<List<double>> getImageEmbedding(String imagePath);
   Future<List<double>> getTextEmbedding(String text);
 

lib/services/semantic_search/ggml_service.dart

@@ -7,6 +7,11 @@ class GGMLService extends EmbeddingService {
   final _computer = Computer.shared();
   final _logger = Logger("GGMLService");
 
+  @override
+  Future<void> init() async {
+    
+  }
+
   @override
   Future<List<double>> getImageEmbedding(String imagePath) async {
     try {

lib/services/semantic_search/semantic_search_service.dart

@@ -46,6 +46,7 @@ class SemanticSearchService {
     if (Platform.isIOS) {
       return;
     }
+    await _embeddingService.init();
     await EmbeddingStore.instance.init(preferences);
     await ModelLoader.instance.init(_computer);
     _setupCachedEmbeddings();