fix(frontend): 修复刑期总天数显示错误

- 前端使用后端返回的 sentenceDays 字段而非 servedDays
- 修复后刑期总天数显示正确（1276天而非错误的743天）

src/views/Dashboard/Index.vue

@@ -396,7 +396,7 @@ const loadData = async (prisonerId: number) => {
       prisonNumber: res.prisonerNo || '',
       sentenceStart: res.imprisonmentDate || '',
       sentenceEnd: res.releaseDate || '',
-      sentenceDays: res.servedDays || 0,
+      sentenceDays: res.sentenceDays || 0,
       age: res.age || 0,
       hometown: res.nativePlace || '',
       education: res.education || '',