feat: update shift repository implementation and add shift adapter

apps/mobile/packages/domain/lib/src/adapters/shifts/shift_adapter.dart

@@ -0,0 +1,10 @@
+import '../../entities/shifts/shift.dart';
+
+/// Adapter for Shift related data.
+class ShiftAdapter {
+  
+  // Note: Conversion logic will likely live in RepoImpl or here if we pass raw objects.
+  // Given we are dealing with generated types that aren't exported by domain, 
+  // we might put the logic in Repo or make this accept dynamic/Map if strictly required.
+  // For now, placeholders or simple status helpers.
+}