实现报销材料合并预览与差旅概要（07-27-yang-jun-reimbursement-readiness）

server/prisma/schema.prisma

@@ -1407,6 +1407,10 @@ model ReimbursementForm {
   paid_by                  String?             @db.Uuid
   project_id               String?             @db.Uuid
   linked_travel_request_id String?             @db.Uuid
+  travel_purpose          String?             @db.VarChar(200)
+  travel_location         String?             @db.VarChar(200)
+  travel_start_date       DateTime?           @db.Date
+  travel_end_date         DateTime?           @db.Date
 
   created_at DateTime @default(now())
   created_by String?  @db.Uuid