Add Ladill POS v1 — register, Pay checkout, and commerce links.

Staff-facing counter register at pos.ladill.com with catalog cart, cash and
MoMo/card checkout via Ladill Pay, CRM timeline/import, invoice prefill, and
Merchant catalog import.

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

app/Http/Controllers/Public/PaymentController.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace App\Http\Controllers\Public;
+
+use App\Http\Controllers\Controller;
+use App\Models\QrCode;
+use App\Services\Mini\MiniPaymentService;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\View\View;
+use RuntimeException;
+
+class PaymentController extends Controller
+{
+    public function __construct(private MiniPaymentService $payments) {}
+
+    public function pay(Request $request, string $shortCode): JsonResponse|RedirectResponse
+    {
+        $qrCode = QrCode::query()
+            ->with('user.qrSetting')
+            ->where('short_code', $shortCode)
+            ->where('type', QrCode::TYPE_PAYMENT)
+            ->where('is_active', true)
+            ->firstOrFail();
+
+        $validated = $request->validate([
+            'amount' => 'required|numeric|min:0.01',
+        ]);
+
+        try {
+            $result = $this->payments->initiate($qrCode, $validated);
+        } catch (RuntimeException $e) {
+            if ($request->expectsJson()) {
+                return response()->json(['error' => $e->getMessage()], 422);
+            }
+
+            return back()->withInput()->with('error', $e->getMessage());
+        }
+
+        if ($request->expectsJson()) {
+            return response()->json(['checkout_url' => $result['checkout_url']]);
+        }
+
+        return redirect()->away($result['checkout_url']);
+    }
+
+    public function callback(Request $request, string $shortCode): RedirectResponse|View
+    {
+        $reference = trim((string) $request->query('reference', ''));
+        if ($reference === '') {
+            return redirect('/q/'.$shortCode)->with('error', 'Missing payment reference.');
+        }
+
+        try {
+            $payment = $this->payments->complete($reference);
+        } catch (RuntimeException $e) {
+            return redirect('/q/'.$shortCode)->with('error', $e->getMessage());
+        }
+
+        return view('public.qr.payment-confirmed', [
+            'payment' => $payment,
+            'qrCode' => $payment->qrCode,
+        ]);
+    }
+}