chore: aud확인 로그 추가

Author: jinwon1234

src/main/java/apptive/team5/oauth2/component/AppleApiConnector.java

@@ -81,6 +81,7 @@ public Claims verifyIdentityToken(String identityToken) {
         }
 
         Set<String> audience = tokenClaims.getAudience();
+        log.info("Apple identity token audience: {}", audience);
 
         if (audience == null || !audience.contains(clientId)) {
             log.info("audience mismatch");