fix(marketing): 修复 voucher_batch 联表条件错误

- 将 voucher_batch 联表条件由 voucher_id 改为 channel_activity_id
- 修正子查询筛选逻辑以确保正确关联 channel_activity_id
- 防止因错误关联导致的数据重复问题

server/internal/schema/marketing.go

@@ -35,7 +35,7 @@ func (marketingSchema) BuildJoins(need map[string]bool, main string) []string {
 		out = append(out, " LEFT JOIN `voucher` ON `voucher`.id = (SELECT MAX(v2.id) FROM `voucher` v2 WHERE v2.channel_activity_id = `order_voucher`.channel_activity_id)")
 	}
 	if need["voucher_batch"] {
-		out = append(out, " LEFT JOIN `voucher_batch` ON `voucher_batch`.id = (SELECT MAX(vb2.id) FROM `voucher_batch` vb2 WHERE vb2.voucher_id = `voucher`.id)")
+		out = append(out, " LEFT JOIN `voucher_batch` ON `voucher_batch`.id = (SELECT MAX(vb2.id) FROM `voucher_batch` vb2 WHERE vb2.channel_activity_id = `order_voucher`.channel_activity_id)")
 	}
 	if need["merchant_key_send"] {
 		// MAX ID 子查询去重