Add automatic push notifications for new blog articles

Implement automatic web push notifications for new articles via `seed.ts`, and update `replit.md` to reflect this feature alongside manual notification capabilities.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 23852c00-4779-460a-9e0c-d09fee4b6c92
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: fdec50e9-4e94-4779-9307-d1bee9c5c3cd
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/f209e72a-0939-48fa-84fc-57854de71967/23852c00-4779-460a-9e0c-d09fee4b6c92/ICRgny1
Replit-Helium-Checkpoint-Created: true

replit.md

@@ -17,7 +17,7 @@ The official website for Folx Music Television (folx.tv). Dark-themed bento grid
 - Recipe widget + full /rezepte subpage (21 recipes across 5 regions: Österreich, Bayern, Schwaben/Baden, Südtirol/Alpen, Norddeutschland) with AI-generated images
 - Google News RSS widget (Volksmusik/Schlager news, 5 items, auto-rotate)
 - Google AdSense integration (ca-pub-4465464714854276)
-- Web Push Notifications (bell icon in header, admin panel at /admin/push)
+- Web Push Notifications (bell icon in header, auto-send on new articles, admin panel at /admin/push)
 - Article listing with featured carousel and category filtering
 - HTML content supports embedded iframes (bunny.net, YouTube, Facebook, Instagram, TikTok)
 - DOMPurify sanitization for safe HTML rendering