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/css/pos.css

@@ -713,18 +713,23 @@
     }
 
     .pago-tabs {
-      display: flex; border-bottom: 2px solid var(--color-border); padding: 0 var(--space-6);
+      display: grid;
+      grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
+      gap: var(--space-2);
+      padding: var(--space-4) var(--space-6);
+      border-bottom: none;
     }
     .pago-tab {
-      padding: var(--space-3) var(--space-5); font-family: var(--font-body);
-      font-size: var(--text-body-sm); font-weight: var(--font-weight-semibold);
-      background: transparent; border: none; color: var(--color-text-muted);
-      cursor: pointer; border-bottom: 2px solid transparent;
-      margin-bottom: -2px; transition: var(--transition-fast);
-      display: flex; align-items: center; gap: var(--space-2);
+      padding: var(--space-3) var(--space-2); font-family: var(--font-body);
+      font-size: var(--text-caption); font-weight: var(--font-weight-semibold);
+      background: var(--color-surface); border: 1px solid var(--color-border);
+      border-radius: var(--radius-md); color: var(--color-text-muted);
+      cursor: pointer; transition: var(--transition-fast);
+      display: flex; align-items: center; justify-content: center;
+      text-align: center; min-height: 44px;
     }
-    .pago-tab:hover { color: var(--color-text-primary); }
-    .pago-tab.active { color: var(--color-text-accent); border-bottom-color: var(--color-primary); }
+    .pago-tab:hover { background: var(--color-surface-2); color: var(--color-text-primary); }
+    .pago-tab.active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
 
     .tab-content { padding: var(--space-6); display: none; }
     .tab-content.active { display: block; }