show curtain in devices and implement dialog for if and then

last integrate with backend

lib/pages/routines/models/curtain/curtain_function.dart

@@ -0,0 +1,49 @@
+import 'package:syncrow_web/pages/device_managment/curtain/model/curtain_model.dart';
+import 'package:syncrow_web/pages/routines/models/curtain/curtain_opertion_value.dart';
+import 'package:syncrow_web/pages/routines/models/device_functions.dart'
+    show DeviceFunction;
+import 'package:syncrow_web/utils/constants/app_enum.dart';
+import 'package:syncrow_web/utils/constants/assets.dart';
+
+abstract class CurtainFunction extends DeviceFunction<CurtainModel> {
+  final String type;
+  CurtainFunction({
+    required super.deviceId,
+    required super.deviceName,
+    required this.type,
+    required super.code,
+    required super.operationName,
+    required super.icon,
+  });
+  List<CurtainOperationalValue> getOperationalValues();
+}
+
+class ControlFunction extends CurtainFunction {
+  ControlFunction({
+    required super.deviceId,
+    required super.deviceName,
+    required super.type,
+    super.code = 'control',
+    super.operationName = 'Control',
+    super.icon = Assets.curtain,
+  });
+
+  @override
+  List<CurtainOperationalValue> getOperationalValues() => [
+        CurtainOperationalValue(
+          icon: Assets.curtain,
+          description: 'OPEN',
+          value: 'open',
+        ),
+        CurtainOperationalValue(
+          icon: Assets.curtain,
+          description: 'STOP',
+          value: 'stop',
+        ),
+        CurtainOperationalValue(
+          icon: Assets.curtain,
+          description: 'CLOSE',
+          value: 'close',
+        )
+      ];
+}