增强 SSH/SFTP 稳定性并完善安全校验与前端交互

backend/src/main/java/com/sshmanager/config/SftpSessionCleanupTask.java

@@ -0,0 +1,29 @@
+package com.sshmanager.config;
+
+import com.sshmanager.controller.SftpController;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+
+@Component
+public class SftpSessionCleanupTask {
+
+    private static final Logger log = LoggerFactory.getLogger(SftpSessionCleanupTask.class);
+
+    @Value("${sshmanager.sftp-session-timeout-minutes:30}")
+    private int sessionTimeoutMinutes;
+
+    private final SftpController sftpController;
+
+    public SftpSessionCleanupTask(SftpController sftpController) {
+        this.sftpController = sftpController;
+    }
+
+    @Scheduled(fixedDelay = 60000)
+    public void cleanupIdleSessions() {
+        log.debug("Running SFTP session cleanup task");
+        sftpController.cleanupExpiredSessions(sessionTimeoutMinutes);
+    }
+}