feat(i18n): convert 38 hardcoded static labels + safe blade wrap + 226 keys

- Convert all remaining static \$modelLabel/\$pluralModelLabel to getter
  methods with __() (AppointmentResource, WorkOrderResource, MasterResource,
  ServiceTemplateResource, LaborResource, and 33 others)
- Safe blade wrap v2 (37 files, 201 wraps): fixed the regex to not match
  `->`, `=>`, `!<` — previous aggressive pass broke @if directives
- Bulk-translate lowercase model-label keys (programări, fișe lucru,
  tehnicieni, șabloane servicii, norme-ore, etc.) — these were the RO
  strings appearing in page titles/breadcrumbs
- Add human RU/EN for mechanic-kpi (Mecanic/Lucrări/Norma ore/etc.)
  and calendar-board words

Tests 306 green. Blade compiles cleanly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

resources/views/site/checkout-stub.blade.php

@@ -19,7 +19,7 @@
     <p style="color:#6b7280;font-size:14px;">{{ __('Factură:') }} <b>{{ $sub->invoice_number ?? '#' . $sub->id }}</b> · {{ number_format($sub->amount, 2) }} {{ $sub->currency }}</p>
 
     <div class="note">
-        <b>Mod stub:</b><br>
+        <b>{{ __('Mod stub:') }}</b><br>
         {{ $note }}<br><br>
         În prod, aici redirectează la pagina {{ $gateway }} Checkout cu sumele și metadatele facturii. La success, webhook-ul marchează automat factura ca plătită.
     </div>