Refactor customer management: migrate from Bloc to Cubit, update state handling, and implement customer search functionality

lib/features/services/blocs/services_cubit.dart

@@ -124,6 +124,7 @@ class ServicesCubit extends Cubit<ServicesState> {
     bool? isBozza,
     bool? resultOk,
     String? customerId,
+    String? customerDisplayName,
   }) {
     if (state.currentService == null) return;
 
@@ -138,6 +139,7 @@ class ServicesCubit extends Cubit<ServicesState> {
       isBozza: isBozza,
       resultOk: resultOk,
       customerId: customerId,
+      customerDisplayName: customerDisplayName,
     );
 
     emit(state.copyWith(currentService: updated));