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>

tests/Feature/PosProTest.php

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+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Pos\ProSubscription;
+use App\Models\User;
+use App\Services\Pos\SubscriptionService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Http;
+use Tests\TestCase;
+
+class PosProTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        config([
+            'billing.api_url' => 'https://ladill.com/api/billing',
+            'billing.api_key' => 'pos-billing-key',
+            'pos.pro.enabled' => true,
+            'pos.pro.price_minor' => 7900,
+        ]);
+    }
+
+    private function user(): User
+    {
+        return User::factory()->create(['public_id' => 'usr_'.uniqid()]);
+    }
+
+    public function test_subscribe_charges_wallet_and_activates(): void
+    {
+        Http::fake(['*/debit' => Http::response(['id' => 1], 201)]);
+        $user = $this->user();
+        $svc = app(SubscriptionService::class);
+
+        [$ok] = $svc->subscribe($user);
+
+        $this->assertTrue($ok);
+        $this->assertTrue($svc->isPro($user));
+        Http::assertSent(fn ($r) => str_contains($r->url(), '/debit') && $r['service'] === 'pos');
+    }
+
+    public function test_free_user_cannot_use_restaurant_mode(): void
+    {
+        $this->assertFalse(app(SubscriptionService::class)->canUseRestaurantMode($this->user()));
+    }
+
+    public function test_renew_suspends_after_grace_when_unpaid(): void
+    {
+        Http::fake(['*/debit' => Http::response(['balance_minor' => 0], 402)]);
+        $user = $this->user();
+        $sub = ProSubscription::create([
+            'user_id' => $user->id, 'status' => 'active', 'price_minor' => 7900,
+            'auto_renew' => true, 'started_at' => now()->subDays(40),
+            'current_period_end' => now()->subDays(5),
+        ]);
+
+        app(SubscriptionService::class)->renewIfDue($sub->fresh());
+
+        $this->assertSame('past_due', $sub->fresh()->status);
+    }
+}