fix: update API endpoint from newapi.sususu.cf to api2.xcodecli.com in scripts and documentation

setup-claude-code.ps1

@@ -52,7 +52,7 @@ Usage: powershell -ExecutionPolicy Bypass -File setup-claude-code.ps1 [OPTIONS]
 
 This script automatically tests multiple API endpoints and selects the working one:
   - https://api.xcodecli.com
-  - https://newapi.sususu.cf
+  - https://api2.xcodecli.com
 
 Options:
   -ApiKey <KEY>  Set the API key
@@ -113,7 +113,7 @@ function Test-ApiConnection {
 
     $testUrls = @(
         "https://api.xcodecli.com",
-        "https://newapi.sususu.cf"
+        "https://api2.xcodecli.com"
     )
 
     Write-Info "Testing API connections..."