feat(ecosystem): add Cascade partner (#735)

Add Cascade to x402 ecosystem page under Infrastructure & Tooling.

- Revenue distribution infrastructure for Solana and Base
- Split payments between contributors, partners, and platforms
- Website: https://cascade.fyi

Author: tenequm

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

@@ -0,0 +1,7 @@
+{
+  "name": "Cascade",
+  "description": "Revenue distribution infrastructure for Solana and Base. Split payments between contributors, partners, and platforms.",
+  "logoUrl": "/logos/cascade.png",
+  "websiteUrl": "https://cascade.fyi",
+  "category": "Infrastructure & Tooling"
+}