feat(settlement): 合伙人账单生成后直接同步并支持打款凭证

去掉总部发送与合伙人确认，财务打款后上传凭证，合伙人即可查看状态。

Co-authored-by: Cursor <cursoragent@cursor.com>

server/dukang-api/prisma/schema.prisma

@@ -1387,6 +1387,7 @@ model PartnerBill {
   totalAmount       Decimal           @map("total_amount") @db.Decimal(10, 2)
   status            PartnerBillStatus @default(PENDING_REVIEW)
   paymentRef        String?           @map("payment_ref") @db.VarChar(128)
+  paymentProofUrls  Json?             @map("payment_proof_urls")
   confirmedAt       DateTime?         @map("confirmed_at") @db.DateTime(3)
   sentAt            DateTime?         @map("sent_at") @db.DateTime(3)
   paidAt            DateTime?         @map("paid_at") @db.DateTime(3)