fix(example): limit messages due to site being public

Author: blurrah

examples/chat-sdk/lib/ai/entitlements.ts

@@ -11,7 +11,7 @@ export const entitlementsByUserType: Record<UserType, Entitlements> = {
 	 * For users without an account
 	 */
 	guest: {
-		maxMessagesPerDay: Infinity,
+		maxMessagesPerDay: 20,
 		availableChatModelIds: ["chat-model", "chat-model-reasoning"],
 	},