Add Vibes DIY (open-source alternative to Bolt.new / Lovable / v0 / Base44)

Following [CONTRIBUTING_TO_OSB.md](https://github.com/junaid33/opensource.builders/blob/main/CONTRIBUTING_TO_OSB.md) — submitting an open-source AI app builder that's a direct alternative to several proprietary "vibe coding" / app-generation tools.

Add open source tool: Vibes DIY
- Repository: https://github.com/VibesDIY/vibes.diy
- Website: https://vibes.diy
- Description: Open-source AI app builder for "vibe coding." Describe an app in plain English and it generates a real, live web app — instantly live at its own link, ready to share with friends, collaborate on with live data, and remix into your own version. No setup, no walled garden — your app, your data.
- Category: Website Builders
- Features: AI app generation from natural language, instant live deploy with its own URL, real-time collaboration on shared data, remix/fork others' apps, self-hosted/open source, no-code

## Open source alternative to

1. Bolt.new - https://bolt.new
2. Lovable - https://lovable.dev
3. v0 by Vercel - https://v0.app
4. Base44 - https://base44.com
5. Replit Agent - https://replit.com

## Additional info

- License: Apache-2.0
- Primary language: TypeScript
- Self-host: fully open source (Apache-2.0) on GitHub
- Similarity score: ~80 vs. Bolt.new / Lovable / v0 / Base44 — covers natural-language app generation, instant hosting at a live URL, and iterative editing by chatting with the app. Vibes DIY additionally emphasizes shareable live apps, real-time collaborative data, and one-click remix/fork.

If any of those proprietary tools aren't on the site yet, happy for them to be added with Vibes DIY linked as an alternative. Can provide more feature-mapping detail on request.

Start with CONTRIBUTING_TO_OSB.md and inspect how existing Website Builders entries are represented in the repository. Add Vibes DIY with its repository, website, description, features, license, language, and alternatives, then verify it appears in the Website Builders category.

Written by the indexing model from the issue text.