고객사 목록 쿼리스트링 연동 및 공통 JSON 파서 도입

lib/features/masters/customer/presentation/controllers/customer_controller.dart

@@ -9,6 +9,8 @@ enum CustomerTypeFilter { all, partner, general }
 enum CustomerStatusFilter { all, activeOnly, inactiveOnly }
 
 class CustomerController extends ChangeNotifier {
+  static const int defaultPageSize = 20;
+
   CustomerController({required CustomerRepository repository})
     : _repository = repository;
 
@@ -20,6 +22,7 @@ class CustomerController extends ChangeNotifier {
   String _query = '';
   CustomerTypeFilter _typeFilter = CustomerTypeFilter.all;
   CustomerStatusFilter _statusFilter = CustomerStatusFilter.all;
+  int _pageSize = defaultPageSize;
   String? _errorMessage;
 
   PaginatedResult<Customer>? get result => _result;
@@ -28,6 +31,7 @@ class CustomerController extends ChangeNotifier {
   String get query => _query;
   CustomerTypeFilter get typeFilter => _typeFilter;
   CustomerStatusFilter get statusFilter => _statusFilter;
+  int get pageSize => _pageSize;
   String? get errorMessage => _errorMessage;
 
   Future<void> fetch({int page = 1}) async {
@@ -60,13 +64,16 @@ class CustomerController extends ChangeNotifier {
 
       final response = await _repository.list(
         page: page,
-        pageSize: _result?.pageSize ?? 20,
+        pageSize: _pageSize,
         query: _query.isEmpty ? null : _query,
         isPartner: isPartner,
         isGeneral: isGeneral,
         isActive: isActive,
       );
       _result = response;
+      if (response.pageSize > 0 && response.pageSize != _pageSize) {
+        _pageSize = response.pageSize;
+      }
     } catch (e) {
       _errorMessage = e.toString();
     } finally {
@@ -76,20 +83,37 @@ class CustomerController extends ChangeNotifier {
   }
 
   void updateQuery(String value) {
+    if (_query == value) {
+      return;
+    }
     _query = value;
     notifyListeners();
   }
 
   void updateTypeFilter(CustomerTypeFilter filter) {
+    if (_typeFilter == filter) {
+      return;
+    }
     _typeFilter = filter;
     notifyListeners();
   }
 
   void updateStatusFilter(CustomerStatusFilter filter) {
+    if (_statusFilter == filter) {
+      return;
+    }
     _statusFilter = filter;
     notifyListeners();
   }
 
+  void updatePageSize(int size) {
+    if (size <= 0 || _pageSize == size) {
+      return;
+    }
+    _pageSize = size;
+    notifyListeners();
+  }
+
   Future<Customer?> create(CustomerInput input) async {
     _setSubmitting(true);
     try {