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/Models/PosLocation.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class PosLocation extends Model
+{
+    protected $fillable = [
+        'owner_ref',
+        'name',
+        'currency',
+        'receipt_footer',
+    ];
+
+    public function products(): HasMany
+    {
+        return $this->hasMany(PosProduct::class, 'location_id');
+    }
+
+    public function sales(): HasMany
+    {
+        return $this->hasMany(PosSale::class, 'location_id');
+    }
+
+    public function scopeOwned(Builder $query, string $ownerRef): Builder
+    {
+        return $query->where('owner_ref', $ownerRef);
+    }
+}