Rebuild atomcms-next foundation on Prisma (align to habbo-next reference)

Replace the superseded Drizzle monorepo scaffold with a single-app Prisma 7
data layer, mirroring the proven habbo-next approach to the shared Arcturus
emulator DB (introspect/conform only, idempotent SQL migrations via a custom
runner; never migrate-diff).

- prisma/schema.prisma: User, UsersCurrency (composite PK), Ban, WebsiteSetting
  mapped to AtomCMS's default.sql columns; client generated to src/generated/prisma
- src/lib/prisma.ts: PrismaMariaDb adapter singleton; src/env.ts zod env
- src/lib/services: siteSettings (cached setting() equivalent) + CurrencyType enum
- prisma/migrations + scripts/apply-migrations.ts: idempotent CMS-table runner

Verified: prisma generate OK, tsc --noEmit exit 0, vitest 6/6 pass.

prisma/schema.prisma

@@ -0,0 +1,102 @@
+// AtomCMS → Next.js conversion data layer.
+//
+// The database schema is OWNED by the Arcturus Morningstar emulator and shared
+// live with the game server. This app conforms to that schema — it never
+// generates or migrates the emulator tables. CMS-only tables (website_*) are
+// created via idempotent SQL in prisma/migrations/*.sql (see apply-migrations).
+//
+// This is the first slice (users / users_currency / bans / website_settings);
+// the full table set will be regenerated via `prisma db pull` once a live DB
+// connection is available.
+
+generator client {
+  provider = "prisma-client"
+  output   = "../src/generated/prisma"
+}
+
+datasource db {
+  provider = "mysql"
+}
+
+enum users_gender {
+  M
+  F
+}
+
+enum bans_type {
+  account
+  ip
+  machine
+  super
+}
+
+/// Emulator-owned core account table (users). Column names mirror default.sql.
+model User {
+  id                Int          @id @default(autoincrement())
+  username          String       @unique(map: "username") @db.VarChar(25)
+  realName          String       @default("KREWS DEV") @map("real_name") @db.VarChar(25)
+  password          String       @db.VarChar(64)
+  mail              String?      @db.VarChar(500)
+  mailVerified      String       @default("0") @map("mail_verified")
+  accountCreated    Int          @map("account_created")
+  accountDayOfBirth Int          @default(0) @map("account_day_of_birth")
+  lastLogin         Int          @default(0) @map("last_login")
+  lastOnline        Int          @default(0) @map("last_online")
+  motto             String       @default("") @db.VarChar(127)
+  look              String       @default("") @db.VarChar(256)
+  gender            users_gender @default(M)
+  rank              Int          @default(1)
+  credits           Int          @default(2500)
+  pixels            Int          @default(500)
+  points            Int          @default(10)
+  online            String       @default("0")
+  // Ephemeral SSO ticket rotated on each emulator handshake ({HOTEL_NAME}-{uuid}).
+  // The emulator validates it byte-for-byte when the Nitro/Flash client connects.
+  authTicket        String       @default("") @map("auth_ticket") @db.VarChar(256)
+  ipRegister        String       @map("ip_register") @db.VarChar(45)
+  ipCurrent         String       @map("ip_current") @db.VarChar(45)
+  machineId         String       @default("") @map("machine_id") @db.VarChar(64)
+  homeRoom          Int          @default(0) @map("home_room")
+  secretKey         String?      @map("secret_key") @db.VarChar(40)
+  pincode           String?      @db.VarChar(11)
+  extraRank         Int?         @map("extra_rank")
+
+  @@map("users")
+}
+
+/// Emulator-owned multi-currency ledger. Composite PK (user_id, type), no id.
+/// Currency types are fixed: Credits=-1, Duckets=0, Diamonds=5, Points=101.
+model UsersCurrency {
+  userId Int @map("user_id")
+  type   Int
+  amount Int @default(0)
+
+  @@id([userId, type])
+  @@map("users_currency")
+}
+
+/// Emulator-owned bans table. Active bans are those with ban_expire > now().
+model Ban {
+  id          Int       @id @default(autoincrement())
+  userId      Int       @map("user_id")
+  ip          String    @default("") @db.VarChar(50)
+  machineId   String    @default("") @map("machine_id") @db.VarChar(255)
+  userStaffId Int       @map("user_staff_id")
+  timestamp   Int
+  banExpire   Int       @default(0) @map("ban_expire")
+  banReason   String    @default("") @map("ban_reason") @db.VarChar(200)
+  type        bans_type @default(account)
+  cfhTopic    Int       @default(-1) @map("cfh_topic")
+
+  @@map("bans")
+}
+
+/// CMS-owned key/value settings (created by prisma/migrations, not the emulator).
+model WebsiteSetting {
+  id      BigInt  @id @default(autoincrement()) @db.UnsignedBigInt
+  key     String  @unique(map: "website_settings_key_unique") @db.VarChar(255)
+  value   String  @db.Text
+  comment String? @db.VarChar(255)
+
+  @@map("website_settings")
+}