Adds @glidemq/fastify to the community plugins list in Ecosystem.md.

@glidemq/fastify is a Fastify plugin for glide-mq - a high-performance message queue powered by Valkey/Redis Streams with a Rust-native client.

Features:

• glideMQPlugin - core plugin decorating fastify.glidemq with queue registry and lifecycle cleanup
• glideMQRoutes - 11 REST endpoints for queue management with proper Fastify encapsulation
• SSE event streaming for real-time queue monitoring
• Prefix support and multiple route registrations
• Optional Zod validation with graceful fallback
• In-memory testing mode (no Valkey needed) with createTestApp() helper

npm: npm install @glidemq/fastify glide-mq fastify