Add POS Pro subscription billing and free-tier limits.

Wallet-backed Pro unlocks unlimited products, restaurant mode, catalog imports, and ecosystem sync features.

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

app/Http/Controllers/Pos/ProController.php

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+<?php
+
+namespace App\Http\Controllers\Pos;
+
+use App\Http\Controllers\Controller;
+use App\Services\Pos\SubscriptionService;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\View\View;
+
+class ProController extends Controller
+{
+    public function __construct(private readonly SubscriptionService $subscriptions) {}
+
+    public function index(Request $request): View
+    {
+        $user = ladill_account() ?? $request->user();
+
+        return view('pos.pro.index', [
+            'subscription' => $this->subscriptions->subscriptionFor($user),
+            'isPro' => $this->subscriptions->isPro($user),
+            'gatingActive' => $this->subscriptions->gatingActive(),
+            'priceMinor' => $this->subscriptions->priceMinor(),
+            'currency' => (string) config('pos.pro.currency', 'GHS'),
+        ]);
+    }
+
+    public function subscribe(Request $request): RedirectResponse
+    {
+        [$ok, $message] = $this->subscriptions->subscribe(ladill_account() ?? $request->user());
+
+        return redirect()->route('pos.pro.index')->with($ok ? 'success' : 'error', $message);
+    }
+
+    public function cancel(Request $request): RedirectResponse
+    {
+        [$ok, $message] = $this->subscriptions->cancel(ladill_account() ?? $request->user());
+
+        return redirect()->route('pos.pro.index')->with($ok ? 'success' : 'error', $message);
+    }
+}