fix(auth): send client token in CAS ticket validation request

The SSO server requires the registered application token (clientToken) to
authenticate the ticket validation request. Include it in the POST body.

server/skillhub-auth/src/main/java/com/iflytek/skillhub/auth/sso/SsoClient.java

@@ -35,7 +35,8 @@ public class SsoClient {
     public SsoUser validateTicket(String ticket) {
         var request = Map.of(
                 "Ticket", ticket,
-                "Url", properties.getClientUrl()
+                "Url", properties.getClientUrl(),
+                "Token", properties.getClientToken()
         );
         var validateUrl = UriComponentsBuilder.fromHttpUrl(properties.getBaseUrl())
                 .path(properties.getValidatePath())