feat: cashier/counter reports, service-order & remission flows, Rached migration utils

- Add "Mis cortes de caja" report for cashiers/counters with sales detail.
- Cash register history scoped to own cuts for non-admin roles; new /register/<id>/sales endpoint.
- Remove dashboard from cashier menu; add Reports to cashier/counter.
- Service orders: assign mechanic, budget field, invoice flag, counter/cashier can add items/remissions, convert to remission.
- Remission notes module (UI, CSS, courier, counter remissions).
- Customer hard-delete and vehicle/customer linkage in workshop.
- POS: always show search results, compact payment grid, credit validation, tier pricing (5%/10%), ticket with customer/folio.
- Inventory: CSV template with sku_secondary, alias import.
- Rached migration scripts and DB migrations.
- Version-bump cached JS/CSS query strings.

Excludes local Rached session tokens/captures (rached_*.json / rached_*.txt).

pos/static/js/i18n.js

@@ -10,6 +10,7 @@ var I18N = {
     'catalog': 'Catalogo',
     'inventory': 'Inventario',
     'diagrams': 'Diagramas',
+    'remission_notes': 'Notas de Remisión',
     'customers': 'Clientes',
     'invoicing': 'Facturacion',
     'accounting': 'Contabilidad',
@@ -166,6 +167,7 @@ var I18N = {
     'catalog': 'Catalog',
     'inventory': 'Inventory',
     'diagrams': 'Diagrams',
+    'remission_notes': 'Remission Notes',
     'customers': 'Customers',
     'invoicing': 'Invoicing',
     'accounting': 'Accounting',