Enhance CORS configuration and WebSocket origin settings to include additional localhost ports. Improve error handling in SftpController and SftpView for better debugging and user feedback.

backend/src/main/java/com/sshmanager/controller/SftpController.java

@@ -6,6 +6,8 @@ import com.sshmanager.entity.User;
 import com.sshmanager.repository.UserRepository;
 import com.sshmanager.service.ConnectionService;
 import com.sshmanager.service.SftpService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
@@ -23,6 +25,8 @@ import java.util.stream.Collectors;
 @RequestMapping("/api/sftp")
 public class SftpController {
 
+    private static final Logger log = LoggerFactory.getLogger(SftpController.class);
+
     private final ConnectionService connectionService;
     private final UserRepository userRepository;
     private final SftpService sftpService;
@@ -61,7 +65,7 @@ public class SftpController {
     }
 
     @GetMapping("/list")
-    public ResponseEntity<List<SftpFileInfo>> list(
+    public ResponseEntity<?> list(
             @RequestParam Long connectionId,
             @RequestParam(required = false, defaultValue = ".") String path,
             Authentication authentication) {
@@ -74,7 +78,10 @@ public class SftpController {
                 .collect(Collectors.toList());
             return ResponseEntity.ok(dtos);
         } catch (Exception e) {
-            return ResponseEntity.status(500).build();
+            log.warn("SFTP list failed: connectionId={}, path={}", connectionId, path, e);
+            Map<String, String> err = new HashMap<>();
+            err.put("error", e.getMessage() != null ? e.getMessage() : "List failed");
+            return ResponseEntity.status(500).body(err);
         }
     }
 
@@ -90,7 +97,10 @@ public class SftpController {
             result.put("path", pwd);
             return ResponseEntity.ok(result);
         } catch (Exception e) {
-            return ResponseEntity.status(500).build();
+            log.warn("SFTP pwd failed: connectionId={}", connectionId, e);
+            Map<String, String> err = new HashMap<>();
+            err.put("error", e.getMessage() != null ? e.getMessage() : "pwd failed");
+            return ResponseEntity.status(500).body(err);
         }
     }