feat(server): add Prisma schema with all 8 data models

- User, CardType, Membership, WeekTemplate, TimeSlot, Booking, Order, StudioConfig
- PrismaService and global PrismaModule
- snake_case column mapping with camelCase TypeScript fields
- Proper indexes and unique constraints

packages/server/prisma/schema.prisma

@@ -0,0 +1,204 @@
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+// ===== Enums =====
+
+enum UserRole {
+  MEMBER
+  ADMIN
+}
+
+enum CardTypeCategory {
+  TIMES
+  DURATION
+  TRIAL
+}
+
+enum MembershipStatus {
+  ACTIVE
+  EXPIRED
+  USED_UP
+}
+
+enum TimeSlotStatus {
+  OPEN
+  FULL
+  CLOSED
+}
+
+enum TimeSlotSource {
+  TEMPLATE
+  MANUAL
+}
+
+enum BookingStatus {
+  CONFIRMED
+  CANCELLED
+  COMPLETED
+  NO_SHOW
+}
+
+enum OrderStatus {
+  PENDING
+  PAID
+  REFUNDED
+}
+
+// ===== Models =====
+
+model User {
+  id        String   @id @default(uuid())
+  openid    String   @unique
+  unionid   String?
+  phone     String?
+  nickname  String   @default("")
+  avatarUrl String?  @map("avatar_url")
+  role      UserRole @default(MEMBER)
+  createdAt DateTime @default(now()) @map("created_at")
+  updatedAt DateTime @updatedAt @map("updated_at")
+
+  memberships Membership[]
+  bookings    Booking[]
+  orders      Order[]
+
+  @@map("users")
+}
+
+model CardType {
+  id            String           @id @default(uuid())
+  name          String
+  type          CardTypeCategory
+  totalTimes    Int?             @map("total_times")
+  durationDays  Int              @map("duration_days")
+  price         Decimal          @db.Decimal(10, 0)
+  originalPrice Decimal?         @map("original_price") @db.Decimal(10, 0)
+  description   String?
+  isActive      Boolean          @default(true) @map("is_active")
+  sortOrder     Int              @default(0) @map("sort_order")
+  createdAt     DateTime         @default(now()) @map("created_at")
+  updatedAt     DateTime         @updatedAt @map("updated_at")
+
+  memberships Membership[]
+  orders      Order[]
+
+  @@map("card_types")
+}
+
+model Membership {
+  id             String           @id @default(uuid())
+  userId         String           @map("user_id")
+  cardTypeId     String           @map("card_type_id")
+  remainingTimes Int?             @map("remaining_times")
+  startDate      DateTime         @map("start_date")
+  expireDate     DateTime         @map("expire_date")
+  status         MembershipStatus @default(ACTIVE)
+  createdAt      DateTime         @default(now()) @map("created_at")
+  updatedAt      DateTime         @updatedAt @map("updated_at")
+
+  user     User      @relation(fields: [userId], references: [id])
+  cardType CardType  @relation(fields: [cardTypeId], references: [id])
+  bookings Booking[]
+
+  @@index([userId])
+  @@index([status])
+  @@map("memberships")
+}
+
+model WeekTemplate {
+  id        String   @id @default(uuid())
+  dayOfWeek Int      @map("day_of_week")
+  startTime String   @map("start_time")
+  endTime   String   @map("end_time")
+  capacity  Int      @default(1)
+  isActive  Boolean  @default(true) @map("is_active")
+  createdAt DateTime @default(now()) @map("created_at")
+  updatedAt DateTime @updatedAt @map("updated_at")
+
+  timeSlots TimeSlot[]
+
+  @@map("week_templates")
+}
+
+model TimeSlot {
+  id          String         @id @default(uuid())
+  date        DateTime       @db.Date
+  startTime   String         @map("start_time")
+  endTime     String         @map("end_time")
+  capacity    Int            @default(1)
+  bookedCount Int            @default(0) @map("booked_count")
+  status      TimeSlotStatus @default(OPEN)
+  source      TimeSlotSource @default(TEMPLATE)
+  templateId  String?        @map("template_id")
+  createdAt   DateTime       @default(now()) @map("created_at")
+  updatedAt   DateTime       @updatedAt @map("updated_at")
+
+  template WeekTemplate? @relation(fields: [templateId], references: [id])
+  bookings Booking[]
+
+  @@unique([date, startTime, endTime])
+  @@index([date])
+  @@index([status])
+  @@map("time_slots")
+}
+
+model Booking {
+  id           String        @id @default(uuid())
+  userId       String        @map("user_id")
+  timeSlotId   String        @map("time_slot_id")
+  membershipId String        @map("membership_id")
+  status       BookingStatus @default(CONFIRMED)
+  cancelledAt  DateTime?     @map("cancelled_at")
+  createdAt    DateTime      @default(now()) @map("created_at")
+  updatedAt    DateTime      @updatedAt @map("updated_at")
+
+  user       User       @relation(fields: [userId], references: [id])
+  timeSlot   TimeSlot   @relation(fields: [timeSlotId], references: [id])
+  membership Membership @relation(fields: [membershipId], references: [id])
+
+  @@unique([userId, timeSlotId])
+  @@index([userId])
+  @@index([status])
+  @@map("bookings")
+}
+
+model Order {
+  id              String      @id @default(uuid())
+  userId          String      @map("user_id")
+  cardTypeId      String      @map("card_type_id")
+  orderNo         String      @unique @map("order_no")
+  amount          Decimal     @db.Decimal(10, 0)
+  status          OrderStatus @default(PENDING)
+  wxTransactionId String?     @map("wx_transaction_id")
+  paidAt          DateTime?   @map("paid_at")
+  createdAt       DateTime    @default(now()) @map("created_at")
+  updatedAt       DateTime    @updatedAt @map("updated_at")
+
+  user     User     @relation(fields: [userId], references: [id])
+  cardType CardType @relation(fields: [cardTypeId], references: [id])
+
+  @@index([userId])
+  @@index([status])
+  @@map("orders")
+}
+
+model StudioConfig {
+  id               String   @id @default(uuid())
+  name             String
+  logo             String?
+  bannerUrl        String?  @map("banner_url")
+  address          String   @default("")
+  phone            String   @default("")
+  latitude         Decimal? @db.Decimal(10, 7)
+  longitude        Decimal? @db.Decimal(10, 7)
+  cancelHoursLimit Int      @default(2) @map("cancel_hours_limit")
+  photos           Json     @default("[]")
+  updatedAt        DateTime @updatedAt @map("updated_at")
+
+  @@map("studio_config")
+}

packages/server/src/app.module.ts

@@ -1,6 +1,7 @@
 import { Module } from '@nestjs/common'
 import { ConfigModule } from '@nestjs/config'
 import { AppController } from './app.controller'
+import { PrismaModule } from './prisma/prisma.module'
 
 @Module({
   imports: [
@@ -8,6 +9,7 @@ import { AppController } from './app.controller'
       isGlobal: true,
       envFilePath: ['.env.local', '.env'],
     }),
+    PrismaModule,
   ],
   controllers: [AppController],
 })

packages/server/src/prisma/prisma.module.ts

@@ -0,0 +1,9 @@
+import { Global, Module } from '@nestjs/common'
+import { PrismaService } from './prisma.service'
+
+@Global()
+@Module({
+  providers: [PrismaService],
+  exports: [PrismaService],
+})
+export class PrismaModule {}

packages/server/src/prisma/prisma.service.ts

@@ -0,0 +1,16 @@
+import { Injectable, OnModuleInit, OnModuleDestroy } from '@nestjs/common'
+import { PrismaClient } from '@prisma/client'
+
+@Injectable()
+export class PrismaService
+  extends PrismaClient
+  implements OnModuleInit, OnModuleDestroy
+{
+  async onModuleInit() {
+    await this.$connect()
+  }
+
+  async onModuleDestroy() {
+    await this.$disconnect()
+  }
+}