feat: add monthly category

lib/views/monthly/monthly_list_state.dart

@@ -1,9 +1,11 @@
 import 'dart:convert';
+import 'package:didvan/config/auth_config.dart';
 import 'package:didvan/constants/assets.dart';
 import 'package:didvan/models/category.dart';
 import 'package:didvan/models/enums.dart';
 import 'package:didvan/models/monthly/monthly_model.dart';
 import 'package:didvan/providers/core.dart';
+import 'package:didvan/services/content/content_service.dart';
 import 'package:didvan/services/network/request.dart';
 import 'package:didvan/services/network/request_helper.dart';
 import 'package:flutter/material.dart';
@@ -56,10 +58,68 @@ class MonthlyListState extends CoreProvier {
 
   bool get searching => searchQuery.isNotEmpty;
 
+  /// شناسه‌ی دسته‌ی «ماهنامه» در content-service.
+  static const String _monthlyCategoryId =
+      'd5e8b2c4-7f31-4a92-bc6f-8e2a5d1c3b47';
+
   Future<void> fetchMonthlyList() async {
     appState = AppState.busy;
     notifyListeners();
 
+    // مسیر جدید: content-service.
+    if (!AuthConfig.useLegacyApi) {
+      try {
+        final res = await ContentService.instance.getContents(
+          page: 1,
+          limit: 30,
+          filterStatus: '\$in:accepted,published',
+          categoryId: _monthlyCategoryId,
+          sortBy: const [MapEntry('createdAt', 'DESC')],
+        );
+        if (!res.isSuccess || res.data == null) {
+          appState = AppState.failed;
+          notifyListeners();
+          return;
+        }
+        // endpoint لیست body نمی‌فرستد، پس برای هر آیتم detail کامل را
+        // می‌گیریم تا fileUrl پر شود.
+        final fetches = res.data!.data.map((c) async {
+          final detail = await ContentService.instance.getContent(c.id);
+          if (detail.isSuccess && detail.data != null) {
+            return detail.data!;
+          }
+          return c;
+        }).toList();
+        final fullItems = await Future.wait(fetches);
+        _allMonthlyItems = fullItems.map((c) {
+          final fileUrl = c.videoUrl ?? c.audioUrl ?? '';
+          final dateIso = (c.publishedAt ?? c.createdAt)?.toIso8601String() ??
+              DateTime.now().toIso8601String();
+          return MonthlyItem(
+            id: c.id.hashCode,
+            title: c.title,
+            image: c.coverImage ?? '',
+            description: c.summary ?? '',
+            pageNumber: 0,
+            publishedAt: dateIso,
+            file: fileUrl,
+            link: null,
+            tags: const <MonthlyTag>[],
+            isLiked: c.isLiked,
+            isBookmarked: c.isBookmarked,
+          );
+        }).toList();
+        monthlyItems = _applyFilters(_allMonthlyItems);
+        appState = AppState.idle;
+      } catch (e) {
+        debugPrint('❌ monthly (content-service) failed: $e');
+        appState = AppState.failed;
+      }
+      notifyListeners();
+      return;
+    }
+
+    // مسیر legacy.
     try {
       const url = '${RequestHelper.baseUrl}/monthly';
       debugPrint('Fetching monthly list from: $url');