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/Api/MeController.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+class MeController extends Controller
+{
+    public function __invoke(Request $request): JsonResponse
+    {
+        $user = $request->user();
+        $account = ladill_account();
+
+        return response()->json([
+            'data' => [
+                'id' => $user->id,
+                'public_id' => $user->public_id,
+                'name' => $user->name,
+                'email' => $user->email,
+                'acting_account' => [
+                    'id' => $account->id,
+                    'public_id' => $account->public_id,
+                    'name' => $account->name,
+                    'email' => $account->email,
+                ],
+                'accessible_account_ids' => $user->accessibleAccounts()->pluck('id')->values(),
+            ],
+        ]);
+    }
+}