Add Agent Gateway — unified REST API for AI agent infrastructure

[Robocular]

Summary

Agent Gateway is a free unified REST API for AI agent infrastructure. It provides:

• Real-time crypto prices for 500+ tokens via Hyperliquid (no API key required)

• 35+ AI agent infrastructure services: LLM access, identity, email, scheduling, web scraping, and more

• OpenAPI 3.1.0 spec at /openapi.json

• URL: https://agent-gateway-kappa.vercel.app

• Categories: AI, API Building, Blockchain

Added alphabetically before Agent Security in resources/a.ts.

[github-actions]

New resource link: https://agent-gateway-kappa.vercel.app

[github-actions]

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Resource Validation Errors

🔤 Alphabetical Order

• n.ts:38: Resource "NAT Checker" should come before "NativeBridge"

📊 Too Many Categories

• s.ts:458: Resource "SlingSite": Has 8 categories (max 3)

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