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

setup-claude-code.sh

@@ -80,7 +80,7 @@ test_api_connection() {
 
     local test_urls=(
         "https://api.xcodecli.com"
-        "https://newapi.sususu.cf"
+        "https://api2.xcodecli.com"
     )
 
     print_info "Testing API connections..." >&2
@@ -207,7 +207,7 @@ Usage: $0 [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:
   -k, --key KEY     Set the API key