fix: 用药编辑字段名修正 - 黑屏修复

- times→timeOfDay, start_date→startDate, end_date→endDate
- 去掉不存在的weekday字段
- 添加source=Manual
- frequency固定传Daily

health_app/lib/pages/medication/medication_edit_page.dart

@@ -87,12 +87,12 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
         await service.create({
           'name': item.name,
           'dosage': item.dosage,
-          'frequency': item.frequency,
+          'frequency': 'Daily',
-          'times': timesStr,
+          'timeOfDay': timesStr,
-          'start_date': item.startDate.toIso8601String().split('T')[0],
+          'startDate': item.startDate.toIso8601String().split('T')[0],
           if (item.endDate != null)
-            'end_date': item.endDate!.toIso8601String().split('T')[0],
+            'endDate': item.endDate!.toIso8601String().split('T')[0],
-          if (item.frequency == '每周1次') 'weekday': item.weekday,
+          'source': 'Manual',
         });
       }
       if (!mounted) return;