R0.4: Seeder produktionssicher (PlanSeeder, keine Fake-Stripe-IDs, Dev-User-Guard)

- PlanSeeder (Starter/Business/Pro/Agency) haengt jetzt im DatabaseSeeder
- PaymentOptionSeeder erfindet keine prod_/price_placeholder-IDs mehr
  (Spalten nullable; echte Verknuepfung via Stripe-Sync/Pflege)
- Demo-Zugaenge admin@pressekonto.test/test@example.com (Passwort
  "password") werden nur noch in local/testing angelegt

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/Feature/DatabaseSeederTest.php

@@ -0,0 +1,48 @@
+<?php
+
+use App\Models\PaymentOption;
+use App\Models\Plan;
+use App\Models\User;
+use Database\Seeders\DatabaseSeeder;
+use Tests\TestCase;
+
+test('database seeder seeds roles, plans and payment options', function () {
+    /** @var TestCase $this */
+    $this->seed(DatabaseSeeder::class);
+
+    expect(Plan::query()->count())->toBe(4);
+    expect(PaymentOption::query()->count())->toBe(3);
+});
+
+test('payment option seeder does not invent stripe ids', function () {
+    /** @var TestCase $this */
+    $this->seed(DatabaseSeeder::class);
+
+    expect(PaymentOption::query()->whereNotNull('stripe_price_id')->exists())->toBeFalse();
+    expect(PaymentOption::query()->whereNotNull('stripe_product_id')->exists())->toBeFalse();
+});
+
+test('dev users are seeded outside production', function () {
+    /** @var TestCase $this */
+    $this->seed(DatabaseSeeder::class);
+
+    expect(User::findByEmail('admin@pressekonto.test'))->not->toBeNull();
+    expect(User::findByEmail('test@example.com'))->not->toBeNull();
+});
+
+test('dev users are not seeded in production', function () {
+    /** @var TestCase $this */
+    $originalEnv = $this->app['env'];
+    $this->app['env'] = 'production';
+
+    try {
+        // Direkt statt über artisan db:seed – das Command würde in
+        // "production" interaktiv um Bestätigung bitten.
+        (new DatabaseSeeder)->setContainer($this->app)->__invoke();
+    } finally {
+        $this->app['env'] = $originalEnv;
+    }
+
+    expect(User::query()->count())->toBe(0);
+    expect(Plan::query()->count())->toBe(4);
+});