add fileentity

src/main/java/ru/soune/no_copy/exception/FileEntityNotFoundException.java

@@ -0,0 +1,11 @@
+package ru.soune.no_copy.exception;
+
+public class FileEntityNotFoundException extends RuntimeException {
+    public FileEntityNotFoundException(String fileId) {
+        super("FileEntity not found with ID: " + fileId);
+    }
+
+    public FileEntityNotFoundException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}