feat(trade): add on-site pickup order flow

Product flag, ON_SITE_PICKUP delivery, mini confirm/receive pages; pay skips warehouse auto-advance.

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

server/dukang-api/prisma/schema.prisma

@@ -262,6 +262,7 @@ enum PayStatus {
 enum DeliveryType {
   LOCAL
   CROSS_CITY
+  ON_SITE_PICKUP
 }
 
 enum FreightPayType {
@@ -451,6 +452,7 @@ model CommonProductItem {
   benefitAmount   Decimal?      @map("benefit_amount") @db.Decimal(10, 2)
   status          ProductStatus @default(DRAFT)
   sortOrder       Int           @default(0) @map("sort_order")
+  allowOnSitePickup Boolean     @default(false) @map("allow_on_site_pickup")
   coverResourceId BigInt?       @map("cover_resource_id") @db.UnsignedBigInt
   detailContent   Json?         @map("detail_content")
   createdAt       DateTime      @default(now()) @map("created_at") @db.DateTime(3)