fix(mining-app): 修复批量补发记录解析字段名

API 返回 records 字段，而非 data 或 items

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/mining-app/lib/data/models/batch_mining_record_model.dart

@@ -46,7 +46,7 @@ class BatchMiningRecordsPageModel extends BatchMiningRecordsPage {
     int page,
     int pageSize,
   ) {
-    final rawItems = json['data'] as List? ?? json['items'] as List? ?? [];
+    final rawItems = json['records'] as List? ?? json['data'] as List? ?? json['items'] as List? ?? [];
     final items = rawItems
         .map((item) => BatchMiningRecordModel.fromJson(item as Map<String, dynamic>))
         .toList();