fix: use UPN as mail fallback in instruct when mail is empty

instruct/handlers.py

@@ -86,7 +86,7 @@ def get_ad_user_info(user_id: str) -> dict | None:
 
     try:
         search_id = user_id.replace("@tcs.sibcem.ru", "@sibcem.ru")
-        entries = search_by_user_id(search_id, ["cn", "mail", "l", "userAccountControl"])
+        entries = search_by_user_id(search_id, ["cn", "mail", "l", "userAccountControl", "userPrincipalName"])
 
         if entries:
             entry = entries[0]
@@ -94,6 +94,11 @@ def get_ad_user_info(user_id: str) -> dict | None:
             raw_mail = str(entry.mail) if 'mail' in entry else ""
             # mail может быть "[]" (пустой LDAP объект), "" или "N/A" — фильтруем
             mail = raw_mail if raw_mail and raw_mail not in ("[]", "N/A", "") else None
+            # Fallback: используем UPN если mail пустой
+            if not mail:
+                raw_upn = str(entry.userPrincipalName) if 'userPrincipalName' in entry else ""
+                if raw_upn and raw_upn not in ("[]", "N/A", ""):
+                    mail = raw_upn
             city = str(entry.l) if 'l' in entry and entry.l.value else "Кемерово"
             return {"cn": cn, "mail": mail, "city": city}
     except Exception as e: