Add Business tier and Paystack prepaid billing for POS.

Co-authored-by: Cursor <cursoragent@cursor.com>

database/migrations/2026_06_30_120000_add_plan_to_pos_pro_subscriptions_table.php

@@ -0,0 +1,26 @@
+<?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_pro_subscriptions', function (Blueprint $table) {
+            if (! Schema::hasColumn('pos_pro_subscriptions', 'plan')) {
+                $table->string('plan', 16)->default('pro')->after('status');
+            }
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('pos_pro_subscriptions', function (Blueprint $table) {
+            if (Schema::hasColumn('pos_pro_subscriptions', 'plan')) {
+                $table->dropColumn('plan');
+            }
+        });
+    }
+};