chore: bump @agentcash/discovery to 1.7.1

Fixes misclassification of free endpoints with x-payment-info: { authMode: "none" }
as paid. inferAuthMode() now uses resolvePaymentInfo() to determine if the field
actually describes a paywall.

Author: onchainlu

apps/scan/package.json

@@ -21,7 +21,7 @@
     "format:check": "pnpm -w format:check:dir ./apps/scan"
   },
   "dependencies": {
-    "@agentcash/discovery": "1.7.0",
+    "@agentcash/discovery": "1.7.1",
     "@agentcash/router": "1.10.1",
     "@ai-sdk/openai": "^2.0.52",
     "@ai-sdk/react": "^2.0.68",