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/codexProviderPresets.ts

@@ -1304,7 +1304,7 @@ requires_openai_auth = true`,
   {
     name: "ClaudeCN",
     websiteUrl: "https://claudecn.top",
-    apiKeyUrl: "https://claudecn.top/register?aff=ccswitch",
+    apiKeyUrl: "https://claudecn.ai/register?aff=HEL9",
     category: "third_party",
     auth: generateThirdPartyAuth(""),
     config: generateThirdPartyConfig(