feat: migrate telegram + ed25519 auth implementation into @marketplaces/auth

packages/auth/src/config.ts

@@ -0,0 +1,7 @@
+import { InjectionToken } from '@angular/core';
+
+/** Base URL for the auth backend, e.g. `https://api.example.com`. Provide from the consuming app's environment config. */
+export const AUTH_API_URL = new InjectionToken<string>('@marketplaces/auth AUTH_API_URL');
+
+/** Telegram bot username used to build QR/deep-link login URLs. Optional — falls back to a default if not provided. */
+export const TELEGRAM_BOT_USERNAME = new InjectionToken<string>('@marketplaces/auth TELEGRAM_BOT_USERNAME');