chore(presets): update ClaudeCN referral link to claudecn.ai/register

Move the ClaudeCN invite link to https://claudecn.ai/register?aff=HEL9
across all 7 app presets (apiKeyUrl) and the four README sponsor rows
(banner + CTA, which previously pointed at the bare .top domain with no
referral tag). The websiteUrl and claudecn.top API endpoints are kept
unchanged, so only the registration/referral link moves to the new
domain and code.

src/config/opencodeProviderPresets.ts

@@ -1804,7 +1804,7 @@ export const opencodeProviderPresets: OpenCodeProviderPreset[] = [
   {
     name: "ClaudeCN",
     websiteUrl: "https://claudecn.top",
-    apiKeyUrl: "https://claudecn.top/register?aff=ccswitch",
+    apiKeyUrl: "https://claudecn.ai/register?aff=HEL9",
     settingsConfig: {
       npm: "@ai-sdk/anthropic",
       name: "ClaudeCN",