connect with backend

lib/providers/mark_list_provider.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+import '../services/mark_list_service.dart';
+
+class MarkListProvider extends ChangeNotifier {
+  MarkListService? _service;
+
+  List<dynamic> marks = [];
+  bool loading = false;
+
+  void init(BuildContext context) {
+    _service = MarkListService(context);
+  }
+
+  Future<void> loadMarks(BuildContext context) async {
+    loading = true;
+    notifyListeners();
+
+    _service ??= MarkListService(context);
+
+    final res = await _service!.getMarks();
+
+    if (res['success'] == true) {
+      marks = res['data'] ?? [];
+    }
+
+    loading = false;
+    notifyListeners();
+  }
+
+  Future<Map<String, dynamic>> addMark(BuildContext context, String mark, String origin, String destination) async {
+    _service ??= MarkListService(context);
+
+    final res = await _service!.addMark({
+      "mark_no": mark,
+      "origin": origin,
+      "destination": destination
+    });
+
+    if (res['success'] == true) {
+      await loadMarks(context); // refresh list
+    }
+
+    return res;
+  }
+}