R57 A1-A6：报销模板与差旅申请关联

server/prisma/schema.prisma

@@ -842,6 +842,23 @@ model ExpenseStandard {
   @@map("expense_standards")
 }
 
+model ReimbursementTemplate {
+  id          String  @id @default(uuid()) @db.Uuid
+  name        String  @db.VarChar(100)
+  description String?
+  items       Json    @default("[]")
+  sort_order  Int     @default(0)
+  enabled     Boolean @default(true)
+
+  created_at DateTime @default(now())
+  created_by String?  @db.Uuid
+  updated_at DateTime @default(now()) @updatedAt
+  updated_by String?  @db.Uuid
+
+  @@index([enabled, sort_order])
+  @@map("reimbursement_templates")
+}
+
 model DocumentSequence {
   document_type   String              @id
   prefix          String
@@ -1269,6 +1286,7 @@ model ReimbursementForm {
   paid_at            DateTime?
   paid_by            String?             @db.Uuid
   project_id         String?             @db.Uuid
+  linked_travel_request_id String?       @db.Uuid
 
   created_at DateTime @default(now())
   created_by String?  @db.Uuid
@@ -1280,6 +1298,7 @@ model ReimbursementForm {
   paid_by_employee Employee?  @relation("ReimbursementPaidBy", fields: [paid_by], references: [id], onDelete: SetNull)
   department       Department @relation(fields: [department_id], references: [id], onDelete: Restrict)
   project          Project?   @relation(fields: [project_id], references: [id], onDelete: SetNull)
+  travel_request   TravelRequest? @relation(fields: [linked_travel_request_id], references: [id], onDelete: SetNull)
 
   items                 ReimbursementItem[]
   invoice_pool_items    InvoicePool[]
@@ -1293,6 +1312,7 @@ model ReimbursementForm {
   @@index([department_id])
   @@index([paid_by])
   @@index([project_id], map: "idx_reimbursement_forms_project")
+  @@index([linked_travel_request_id], map: "idx_reimbursement_forms_linked_travel_request")
   @@index([status])
   @@index([reimbursement_date])
   @@index([owner_id, status, updated_at], map: "idx_reimbursement_owner_status_updated_at")
@@ -2479,6 +2499,7 @@ model TravelRequest {
 
   segments             TravelRequestSegment[]
   travel_orders        TravelOrder[]
+  linked_reimbursements ReimbursementForm[]
   reconciliation_items TravelReconciliationItem[]
   card_authorizations  CardAuthorization[]
   card_transactions    CardTransaction[]