fix: 后端代码格式化

backend/src/main/java/com/openisle/exception/NotFoundException.java

@@ -4,7 +4,8 @@ package com.openisle.exception;
  * Exception representing a missing resource such as a post or user.
  */
 public class NotFoundException extends RuntimeException {
-    public NotFoundException(String message) {
-        super(message);
-    }
+
+  public NotFoundException(String message) {
+    super(message);
+  }
 }