feat(miniapp): add telegram-authenticated shell

apps/miniapp/src/telegram-webapp.ts

@@ -0,0 +1,27 @@
+export interface TelegramWebAppUser {
+  id: number
+  first_name?: string
+  username?: string
+  language_code?: string
+}
+
+export interface TelegramWebApp {
+  initData: string
+  initDataUnsafe?: {
+    user?: TelegramWebAppUser
+  }
+  ready?: () => void
+  expand?: () => void
+}
+
+declare global {
+  interface Window {
+    Telegram?: {
+      WebApp?: TelegramWebApp
+    }
+  }
+}
+
+export function getTelegramWebApp(): TelegramWebApp | undefined {
+  return window.Telegram?.WebApp
+}