Add Agnic.AI project to the ecosystem list (x402-foundation#1178)

* Add Agnic.AI project to the ecosystem list

* Replace the logo with a high res version

* Replace gthe logo with a square one

Author: mahdi

typescript/site/app/ecosystem/partners-data/agnic/metadata.json

@@ -0,0 +1,7 @@
+{
+  "name": "Agnic.AI",
+  "description": "Identity, x402 powered payments, and monetization for AI agents.",
+  "logoUrl": "/logos/agnic-logo.png",
+  "websiteUrl": "https://agnic.ai/x402",
+  "category": "Services/Endpoints"
+}