Feature: Plugin UI, event hooks, DB notifications, web push, webhook retry, games pages, rate limiting, tests

- Plugin admin UI: enable/disable per plugin with config forms
- Event hooks system: HookManager with on/off/emit for plugin events
- Database notifications: persistent via WebsiteNotification table + Redis pub/sub
- Notification preferences: per-user settings with API endpoints
- Web Push API: browser push notification subscription
- Webhook retry: 3 attempts with exponential backoff (1s/3s/9s) + delivery logs
- Webhook test button + paginated delivery log viewer
- Games: rank/challenge/reward admin pages
- Games: public frontend leaderboard
- Rate limiting: search API (30/min), notification stream dedup
- Unit tests: 28 new tests (registry, notifications, webhooks)
- Prisma migration 0017: website_notifications, website_notification_preferences, website_webhook_logs

prisma/schema.prisma

@@ -2759,3 +2759,50 @@ model WebsitePollVote {
   @@index([userId])
   @@map("website_poll_votes")
 }
+
+model WebsiteNotification {
+  id        BigInt   @id @default(autoincrement()) @db.UnsignedBigInt
+  userId    BigInt   @map("user_id") @db.UnsignedBigInt
+  type      String   @db.VarChar(50)
+  title     String   @db.VarChar(255)
+  body      String?  @db.Text
+  icon      String?  @db.VarChar(50)
+  link      String?  @db.VarChar(500)
+  read      Boolean  @default(false)
+  createdAt DateTime @default(now()) @map("created_at") @db.Timestamp(0)
+
+  @@index([userId, read])
+  @@map("website_notifications")
+}
+
+model WebsiteNotificationPreference {
+  id            BigInt  @id @default(autoincrement()) @db.UnsignedBigInt
+  userId        BigInt  @map("user_id") @db.UnsignedBigInt
+  emailEnabled  Boolean @default(true)  @map("email_enabled")
+  pushEnabled   Boolean @default(true)  @map("push_enabled")
+  friendRequest Boolean @default(true)  @map("friend_request")
+  messages     Boolean @default(true)
+  guildInvite  Boolean @default(true)  @map("guild_invite")
+  events       Boolean @default(true)
+  alerts       Boolean @default(true)
+  achievements Boolean @default(true)
+  radio        Boolean @default(true)
+
+  @@unique([userId])
+  @@map("website_notification_preferences")
+}
+
+model WebsiteWebhookLog {
+  id         BigInt   @id @default(autoincrement()) @db.UnsignedBigInt
+  webhookId  String   @map("webhook_id") @db.VarChar(100)
+  url        String   @db.VarChar(500)
+  event      String   @db.VarChar(100)
+  status     Int      @default(0)
+  response   String?  @db.Text
+  duration   Int      @default(0)
+  success    Boolean  @default(false)
+  createdAt  DateTime @default(now()) @map("created_at") @db.Timestamp(0)
+
+  @@index([webhookId, createdAt])
+  @@map("website_webhook_logs")
+}