feat: 选票自动生成报销明细并支持集中分类（08-29-reimbursement-expense-policy-invoice-guard）

server/prisma/migrations/20260909210000_reimbursement_draft_expense_type/migration.sql

@@ -0,0 +1 @@
+ALTER TABLE "reimbursement_items" ALTER COLUMN "expense_type_id" DROP NOT NULL;