docs: add vazen to ecosystem starter kits (#1554)

## Summary

Adds Vazen to the oRPC ecosystem starter kits section.

Vazen is a production-grade monorepo starter for building full-stack
applications with modern TypeScript tooling, scalable architecture, and
developer-first workflows.

## Changes

- Added Vazen under the "Starter Kits" section
- Included GitHub repository link
- Added GitHub stars badge
- Added short project description

<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

## Documentation
- Expanded the ecosystem's documented starter kits with a new curated
entry for Vazen. This addition includes comprehensive GitHub repository
details, community star engagement metrics, and thorough project
information. Developers now have an expanded selection of starter kit
options when evaluating and selecting appropriate development frameworks
and initialization tools for new projects.

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Author: Hashversion

apps/content/docs/ecosystem.md

@@ -15,6 +15,7 @@ If your project is missing here, please [open a PR](https://github.com/middleapi
 | --------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | [Zap.ts](https://github.com/zap-studio/monorepo)                            | [![Stars](https://img.shields.io/github/stars/zap-studio/monorepo?style=flat)](https://github.com/zap-studio/monorepo)                                   | Next.js boilerplate designed to help you build applications faster using a modern set of tools.                                                                                                                                                                      |
 | [Better-T-Stack](https://github.com/AmanVarshney01/create-better-t-stack)   | [![Stars](https://img.shields.io/github/stars/AmanVarshney01/create-better-t-stack?style=flat)](https://github.com/AmanVarshney01/create-better-t-stack) | A modern CLI tool for scaffolding end-to-end type-safe TypeScript projects with best practices and customizable configurations                                                                                                                                       |
+| [Vazen](https://github.com/stack-found/vazen)                               | [![Stars](https://img.shields.io/github/stars/stack-found/vazen?style=flat)](https://github.com/stack-found/vazen)                                       | A production-grade monorepo starter for building full-stack TypeScript apps with scalable architecture and developer-first tooling.                                                                                                                                  |
 | [create-start-app](https://github.com/AmanVarshney01/create-better-t-stack) | [![Stars](https://img.shields.io/github/stars/TanStack/create-tsrouter-app?style=flat)](https://github.com/TanStack/create-tsrouter-app)                 | Quickly scaffold a new React project with TanStack Router and oRPC                                                                                                                                                                                                   |
 | [create-o3-app](https://github.com/Tony-ArtZ/create-o3-app)                 | [![Stars](https://img.shields.io/github/stars/Tony-ArtZ/create-o3-app?style=flat)](https://github.com/Tony-ArtZ/create-o3-app)                           | The O3 Stack is a "bleeding-edge" full-stack TypeScript framework that uses experimental technologies like oRPC, Drizzle ORM, and ArkType, positioning itself as T3 Stack's more adventurous sibling that prioritizes newest tools over stability.                   |
 | [RT Stack](https://github.com/nktnet1/rt-stack)                             | [![Stars](https://img.shields.io/github/stars/nktnet1/rt-stack?style=flat)](https://github.com/nktnet1/rt-stack)                                         | Lightweight fullstack turborepo with modular components, shared configs, containerized deployments and 100% type-safety. Features React + Vite, TanStack Router, oRPC + Valibot, Better Auth, and Drizzle ORM.                                                       |