feat: add re-import from system buttons for Samba and NFS

Add 'Re-importar del sistema' buttons to the Samba and NFS pages,
mirroring the existing user import flow. Both buttons show a confirm
dialog before calling the respective /api/import/{samba,nfs} endpoints
which replace the DB table with the current system config.

Version bump: 0.6.0 → 0.6.1

web/src/api.ts

@@ -215,6 +215,8 @@ export const api = {
   deleteWatchedMount: (id: number) => request<void>("DELETE", `/system/watched-mounts/${id}`),
 
   // import
+  importSamba: () => request<{ imported: number; message?: string }>("POST", "/import/samba"),
+  importNfs:   () => request<{ imported: number; message?: string }>("POST", "/import/nfs"),
   importUsers: () => request<{ imported: number; message?: string }>("POST", "/import/users"),
 
   // files