fix: 线下签署登记标题英文转中文+完成时间时区+签署记录角标

1. documentTitle 中 contractType 枚举值转中文
   （LABOR→劳务协议、FIXED→固定期限劳动合同等）
2. 签署日期解析改为本地时区构造（new Date(y,m-1,d,12)），
   避免 new Date('2026-08-16') 被解析为 UTC 00:00 导致
   本地 +8 显示为 08:00:00
3. 签署记录 Tab 增加数字角标显示总记录数

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

backend/src/routes/esign.routes.ts

@@ -214,7 +214,10 @@ router.post('/sign-date', async (req: AuthRequest, res: Response, next: NextFunc
     if (contract.signMethod === 'ELECTRONIC') {
       return res.status(400).json({ success: false, error: { code: 'VALIDATION_ERROR', message: '电子签合同的签署日期由电签系统自动回写，不可手动修改' } })
     }
-    const parsedDate = new Date(signDate)
+    // 解析日期字符串（YYYY-MM-DD），手动构造本地中午时间避免时区偏移
+    const dateStr = String(signDate).slice(0, 10)
+    const [y, m, d] = dateStr.split('-').map(Number)
+    const parsedDate = new Date(y, (m || 1) - 1, d || 1, 12, 0, 0, 0)
     if (isNaN(parsedDate.getTime())) {
       return res.status(400).json({ success: false, error: { code: 'VALIDATION_ERROR', message: '签署日期格式无效' } })
     }
@@ -229,6 +232,18 @@ router.post('/sign-date', async (req: AuthRequest, res: Response, next: NextFunc
       select: { id: true },
     })
     if (!existingRecord) {
+      // 合同类型枚举转中文
+      const CONTRACT_TYPE_LABEL: Record<string, string> = {
+        FIXED: '固定期限劳动合同',
+        UNFIXED: '无固定期限劳动合同',
+        UNSIGNED: '未签合同',
+        LABOR: '劳务协议',
+        INTERNSHIP: '实习协议',
+        DISPATCH: '劳务派遣合同',
+        OUTSOURCING: '外包合同',
+        PARTTIME: '非全日制合同',
+      }
+      const contractLabel = CONTRACT_TYPE_LABEL[contract.contractType] || '合同'
       await prisma.eSignRecord.create({
         data: {
           orgId: req.user!.orgId,
@@ -236,7 +251,7 @@ router.post('/sign-date', async (req: AuthRequest, res: Response, next: NextFunc
           employeeId: contract.employeeId,
           scene: 'CONTRACT',
           signMethod: 'PAPER',
-          documentTitle: `${contract.contractType}合同线下签署登记`,
+          documentTitle: `${contractLabel}线下签署登记`,
           status: 'COMPLETED',
           completedAt: parsedDate,
           signedAt: parsedDate,