Wire POS register loyalty earn and redeem through CRM.

Redeem at charge, earn on payment, reverse on cancel, and surface
balances on the till, customer display, sales, and receipts.

database/migrations/2026_07_15_180000_add_loyalty_to_pos_sales.php

@@ -0,0 +1,30 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('pos_sales', function (Blueprint $table) {
+            $table->unsignedInteger('loyalty_discount_minor')->default(0)->after('subtotal_minor');
+            $table->unsignedInteger('loyalty_points_redeemed')->default(0)->after('loyalty_discount_minor');
+            $table->unsignedInteger('loyalty_points_earned')->default(0)->after('loyalty_points_redeemed');
+            $table->string('loyalty_external_ref', 80)->nullable()->after('loyalty_points_earned');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('pos_sales', function (Blueprint $table) {
+            $table->dropColumn([
+                'loyalty_discount_minor',
+                'loyalty_points_redeemed',
+                'loyalty_points_earned',
+                'loyalty_external_ref',
+            ]);
+        });
+    }
+};