Initial commit: SSH Manager (backend + frontend)

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/main/java/com/sshmanager/dto/SftpFileInfo.java

@@ -0,0 +1,15 @@
+package com.sshmanager.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class SftpFileInfo {
+    private String name;
+    private boolean directory;
+    private long size;
+    private long mtime;
+}