feat: 支持商品管理

packages/server/prisma/schema.prisma

@@ -73,6 +73,7 @@ model User {
   createdAt                        DateTime @default(now()) @map("created_at")
   updatedAt                        DateTime @updatedAt @map("updated_at")
 
+  productOrders ProductOrder[]
   bodyMetrics BodyMetric[]
   memberNotes MemberNote[]
   progressPhotos ProgressPhoto[]
@@ -620,3 +621,73 @@ model GrowthShareCard {
   @@index([userId, createdAt])
   @@map("growth_share_cards")
 }
+
+// Inventory counts sellable units; pending orders reserve units immediately.
+enum ProductOrderStatus {
+  PENDING
+  PAID
+  COMPLETED
+  CANCELLED
+}
+
+model Product {
+  id String @id @default(uuid())
+  title String @db.VarChar(80)
+  description String @db.Text
+  coverUrl String @map("cover_url") @db.VarChar(1000)
+  price Int
+  stock Int @default(0)
+  sold Int @default(0)
+  isActive Boolean @default(false) @map("is_active")
+  sortOrder Int @default(0) @map("sort_order")
+  version Int @default(0)
+  createdAt DateTime @default(now()) @map("created_at")
+  updatedAt DateTime @updatedAt @map("updated_at")
+  orders ProductOrder[]
+  stockChanges ProductStockChange[]
+  @@index([isActive, sortOrder])
+  @@map("products")
+}
+
+model ProductOrder {
+  id String @id @default(uuid())
+  orderNo String @unique @map("order_no") @db.VarChar(32)
+  requestId String @map("request_id") @db.VarChar(80)
+  userId String @map("user_id")
+  productId String @map("product_id")
+  title String @db.VarChar(80)
+  coverUrl String @map("cover_url") @db.VarChar(1000)
+  unitPrice Int @map("unit_price")
+  quantity Int
+  amount Int
+  contactName String @map("contact_name") @db.VarChar(40)
+  contactPhone String @map("contact_phone") @db.VarChar(20)
+  status ProductOrderStatus @default(PENDING)
+  pickupCode String @map("pickup_code") @db.VarChar(12)
+  wxTransactionId String? @unique @map("wx_transaction_id")
+  expiresAt DateTime @map("expires_at")
+  paidAt DateTime? @map("paid_at")
+  completedAt DateTime? @map("completed_at")
+  completedBy String? @map("completed_by")
+  createdAt DateTime @default(now()) @map("created_at")
+  updatedAt DateTime @updatedAt @map("updated_at")
+  user User @relation(fields: [userId], references: [id])
+  product Product @relation(fields: [productId], references: [id])
+  @@unique([userId, requestId])
+  @@index([status, expiresAt])
+  @@index([userId, createdAt])
+  @@index([productId, status])
+  @@map("product_orders")
+}
+
+model ProductStockChange {
+  id String @id @default(uuid())
+  productId String @map("product_id")
+  delta Int
+  reason String @db.VarChar(200)
+  operatorId String @map("operator_id")
+  createdAt DateTime @default(now()) @map("created_at")
+  product Product @relation(fields: [productId], references: [id])
+  @@index([productId, createdAt])
+  @@map("product_stock_changes")
+}