logging and diagnostic features added

internal/services/nfs.go

@@ -52,13 +52,16 @@ func (s *NFSService) ApplyConfiguration(exports []models.NFSExport) error {
 		return fmt.Errorf("replace exports: %w", err)
 	}
 
-	// Reload NFS exports
-	if err := s.reloadExports(); err != nil {
+	// Reload NFS exports with error recovery
+	reloadErr := s.reloadExports()
+	if reloadErr != nil {
 		// Try to restore backup on failure
 		if _, err2 := os.Stat(backupPath); err2 == nil {
-			os.Rename(backupPath, s.exportsPath)
+			if restoreErr := os.Rename(backupPath, s.exportsPath); restoreErr != nil {
+				return fmt.Errorf("reload failed and backup restore failed: reload=%v, restore=%v", reloadErr, restoreErr)
+			}
 		}
-		return fmt.Errorf("reload exports: %w", err)
+		return fmt.Errorf("reload exports: %w", reloadErr)
 	}
 
 	return nil