chore: bump version to v0.13.0

Highlights since v0.12.0:

Connectivity (closes #23, #24)
- Modbus TCP gateway + protocol-agnostic machine signal pipeline
- OPC UA gateway with runtime health awareness
- Machine connectivity architecture docs for contributors

Traceability
- Material genealogy: lot-link, console traversal, serial units

Auth & security
- Two-Factor Authentication with TOTP and recovery codes (#41)
- Security review pass

Production / Operator UX
- Workstation routing — restrict operators to their own station
- Real-time polling for workstation queue and production view
- Maintenance reminder popup with sound for all roles

i18n
- Turkish (Türkçe) as third UI language
- Packaging strings extracted to __() translations (PL restored on conflict)

Test suite: unchanged baseline; no new regressions vs v0.12.0.

Author: jakub-przepiora

backend/config/version.php

@@ -1,6 +1,6 @@
 <?php
 
 return [
-    'current' => 'v0.12.0',
+    'current' => 'v0.13.0',
     'archive_url' => env('UPDATE_ARCHIVE_URL', 'https://github.com/Mes-Open/OpenMes/archive/refs/tags/{version}.zip'),
 ];