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/migrations/v4.15_counter_remission.sql

@@ -0,0 +1,18 @@
+-- v4.15: Counter remission note support
+-- Ensures employees with role 'counter' have the base permissions needed to
+-- generate remission notes from the POS.
+
+INSERT INTO employee_permissions (employee_id, permission)
+SELECT e.id, p.permission
+FROM employees e
+CROSS JOIN (
+    VALUES
+        ('pos.remission'),
+        ('pos.view'),
+        ('catalog.view'),
+        ('inventory.view'),
+        ('customers.view'),
+        ('customers.create')
+) AS p(permission)
+WHERE e.role = 'counter'
+ON CONFLICT (employee_id, permission) DO NOTHING;