chore: 시연용 Demo API 제거

Author: howooyeon

src/main/java/com/semosan/api/common/config/DemoProperties.java

@@ -42,9 +42,6 @@ tracking:
 test:
   secret-key: ${TEST_SECRET_KEY}
 
-demo:
-  photo-filenames: ${DEMO_PHOTO_FILENAMES}
-
 discord:
   alert:
     enabled: ${DISCORD_ALERT_ENABLED}

src/main/java/com/semosan/api/domain/demo/controller/DemoController.java

@@ -67,9 +67,6 @@ minio:
   secret-key: ${MINIO_SECRET_KEY}
   public-url: ${MINIO_PUBLIC_URL}
 
-demo:
-  photo-filenames: ${DEMO_PHOTO_FILENAMES}
-
 management:
   endpoints:
     web: