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/User.php

@@ -0,0 +1,94 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\UserFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\HasOne;
+use Illuminate\Foundation\Auth\User as Authenticatable;
+use Illuminate\Notifications\Notifiable;
+use Illuminate\Support\Collection;
+use Laravel\Sanctum\HasApiTokens;
+
+/**
+ * Thin local mirror of the platform identity (auth.ladill.com owns users).
+ */
+class User extends Authenticatable
+{
+    /** @use HasFactory<UserFactory> */
+    use HasApiTokens, HasFactory, Notifiable;
+
+    protected $fillable = ['public_id', 'name', 'email', 'avatar_url', 'password', 'last_app_active_at'];
+
+    protected $hidden = ['password', 'remember_token'];
+
+    protected function casts(): array
+    {
+        return [
+            'email_verified_at' => 'datetime',
+            'last_app_active_at' => 'datetime',
+            'password' => 'hashed',
+        ];
+    }
+
+    public function memberships(): HasMany
+    {
+        return $this->hasMany(QrTeamMember::class, 'user_id')
+            ->where('status', QrTeamMember::STATUS_ACTIVE);
+    }
+
+    public function canAccessAccount(int $accountId): bool
+    {
+        return $accountId === $this->id
+            || $this->memberships()->where('account_id', $accountId)->exists();
+    }
+
+    /** @return Collection<int, User> */
+    public function accessibleAccounts(): Collection
+    {
+        $ids = $this->memberships()->pluck('account_id')->all();
+
+        return collect([$this])->merge(self::whereIn('id', $ids)->get())->unique('id')->values();
+    }
+
+    public function qrWallet(): HasOne
+    {
+        return $this->hasOne(QrWallet::class);
+    }
+
+    public function qrCodes(): HasMany
+    {
+        return $this->hasMany(QrCode::class);
+    }
+
+    public function qrSetting(): HasOne
+    {
+        return $this->hasOne(QrSetting::class);
+    }
+
+    public function pushTokens(): HasMany
+    {
+        return $this->hasMany(UserPushToken::class);
+    }
+
+    public function getOrCreateQrSetting(): QrSetting
+    {
+        return $this->qrSetting()->firstOrCreate([]);
+    }
+
+    public function getOrCreateQrWallet(): QrWallet
+    {
+        return $this->qrWallet()->firstOrCreate(
+            [],
+            ['credit_balance' => 0, 'qr_codes_total' => 0, 'scans_total' => 0, 'status' => QrWallet::STATUS_ACTIVE],
+        );
+    }
+
+    public function avatarUrl(): ?string
+    {
+        $url = trim((string) $this->avatar_url);
+
+        return $url !== '' ? $url : null;
+    }
+}