fix(报销/拨款): 修复ossId精度丢失导致附件下载失败

Number() 会将超出 JS 安全整数范围的雪花ID末位截断，
改为直接保留后端返回的字符串，保持精度。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ruoyi-ui/src/views/hrm/requests/appropriation.vue

@@ -360,7 +360,7 @@ export default {
             items.forEach((item, i) => {
               const reason = [prefix, item.itemName].filter(Boolean).join(' / ')
               this.invoiceItems.push({
-                ossId: Number(ossId),
+                ossId: ossId,
                 itemName: item.itemName || '',
                 reason,
                 amount: item.amount || 0,
@@ -370,7 +370,7 @@ export default {
           } else if (totalAmount) {
             // 没有明细时用总金额创建一条，事由取发票头部信息
             this.invoiceItems.push({
-              ossId: Number(ossId),
+              ossId: ossId,
               itemName: sellerName || '',
               reason: prefix || '',
               amount: totalAmount,

ruoyi-ui/src/views/hrm/requests/reimburse.vue

@@ -335,7 +335,7 @@ export default {
             items.forEach((item, i) => {
               const reason = [prefix, item.itemName].filter(Boolean).join(' / ')
               this.invoiceItems.push({
-                ossId: Number(ossId),
+                ossId: ossId,
                 itemName: item.itemName || '',
                 reason,
                 amount: item.amount || 0,
@@ -345,7 +345,7 @@ export default {
           } else if (totalAmount) {
             // 没有明细时用总金额创建一条，事由取发票头部信息
             this.invoiceItems.push({
-              ossId: Number(ossId),
+              ossId: ossId,
               itemName: sellerName || '',
               reason: prefix || '',
               amount: totalAmount,