fix: SSE 수정

- 카프카 안거치고 바로 전송

Author: HYEONSIKOH

src/main/java/org/dfbf/soundlink/domain/alert/controller/AlertController.java

@@ -21,6 +21,7 @@ public class AlertController {
     public SseEmitter subscribe(
             @AuthenticationPrincipal Long id,
             @RequestHeader(value = "Last-Event-ID", required = false, defaultValue = "") String lastEventId) {
+        System.out.println("id = " + id);
         return alertService.connectAlarm(id, lastEventId);
     }