add api and tool for query mxpassfiles, fixes

libmxclient/mxutils/mxpass.go

@@ -0,0 +1,20 @@
+// Copyright (C) 2026 saces@c-base.org
+// SPDX-License-Identifier: AGPL-3.0-only
+package mxutils
+
+import (
+	"errors"
+	"mxclientlib/determinant/mxpassfile"
+)
+
+func GetMXPassItem(mxpassfile_path string, url string, localpart string, domain string) (*mxpassfile.Entry, error) {
+	pf, err := mxpassfile.ReadPassfile(mxpassfile_path)
+	if err != nil {
+		return nil, err
+	}
+	e := pf.FindPasswordFill(url, localpart, domain)
+	if e == nil {
+		return nil, errors.New("no item found.")
+	}
+	return e, nil
+}