feat(backend): add fastify api, auth, prisma schema and jobs

apps/backend/prisma/schema.prisma

@@ -0,0 +1,81 @@
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+// --------------------------------------------------------------------
+// Users
+//
+// There are exactly two users in this application. Their credentials
+// (username + bcrypt hash) live in env — see apps/backend/src/config/env.ts.
+// The DB stores only "public" fields to scope wishes and serve public
+// profiles. The password hash is intentionally NOT stored here; this keeps
+// the single source of truth for credentials in env and limits the
+// blast-radius of a DB dump.
+// --------------------------------------------------------------------
+model User {
+  id          String   @id
+  username    String   @unique
+  slug        String   @unique
+  displayName String
+  bio         String?
+  avatarUrl   String?
+  createdAt   DateTime @default(now())
+  updatedAt   DateTime @updatedAt
+
+  wishes Wish[]
+}
+
+enum WishStatus {
+  ACTIVE
+  ARCHIVED
+  COMPLETED
+  DELETED
+}
+
+enum ImageSource {
+  DEFAULT
+  OG
+  UPLOADED
+}
+
+model Wish {
+  id           String      @id @default(cuid())
+  userId       String
+  user         User        @relation(fields: [userId], references: [id], onDelete: Cascade)
+  title        String
+  price        Decimal?    @db.Decimal(12, 2)
+  currency     String      @default("RUB")
+  url          String?
+  comment      String?
+  imageUrl     String?
+  imageSource  ImageSource @default(DEFAULT)
+  status       WishStatus  @default(ACTIVE)
+  createdAt    DateTime    @default(now())
+  updatedAt    DateTime    @updatedAt
+  archivedAt   DateTime?
+  completedAt  DateTime?
+  deletedAt    DateTime?
+  sourceWishId String?
+
+  views GuestView[]
+
+  @@index([userId, status])
+  @@index([deletedAt])
+  @@index([createdAt])
+}
+
+model GuestView {
+  id      String   @id @default(cuid())
+  guestId String
+  wishId  String
+  wish    Wish     @relation(fields: [wishId], references: [id], onDelete: Cascade)
+  seenAt  DateTime @default(now())
+
+  @@unique([guestId, wishId])
+  @@index([guestId])
+}