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/Models/Pos/ProSubscription.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Models\Pos;
+
+use App\Models\User;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class ProSubscription extends Model
+{
+    public const STATUS_ACTIVE = 'active';
+
+    public const STATUS_CANCELED = 'canceled';
+
+    public const STATUS_PAST_DUE = 'past_due';
+
+    protected $table = 'pos_pro_subscriptions';
+
+    protected $fillable = [
+        'user_id', 'status', 'price_minor', 'currency', 'auto_renew',
+        'started_at', 'current_period_end', 'last_charged_at', 'canceled_at',
+        'last_reference', 'last_error',
+    ];
+
+    protected $casts = [
+        'auto_renew' => 'boolean',
+        'price_minor' => 'integer',
+        'started_at' => 'datetime',
+        'current_period_end' => 'datetime',
+        'last_charged_at' => 'datetime',
+        'canceled_at' => 'datetime',
+    ];
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function entitled(): bool
+    {
+        return $this->status !== self::STATUS_PAST_DUE
+            && $this->current_period_end !== null
+            && $this->current_period_end->isFuture();
+    }
+}