feat: Complete checkout overhaul with Stripe PaymentIntent integration and abandoned cart recovery

database/migrations/2025_10_07_222101_create_abandoned_checkouts_table.php

@@ -0,0 +1,41 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('abandoned_checkouts', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('user_id')->constrained()->onDelete('cascade');
+            $table->foreignId('package_id')->constrained()->onDelete('cascade');
+            $table->string('email'); // Denormalisiert für Performance
+            $table->json('checkout_state')->nullable(); // Gespeicherter Checkout-Zustand
+            $table->integer('last_step')->default(1); // Letzter erreichter Schritt
+            $table->timestamp('abandoned_at');
+            $table->timestamp('reminded_at')->nullable(); // Wann zuletzt erinnert
+            $table->string('reminder_stage')->default('none'); // none, 1h, 24h, 1w
+            $table->timestamp('expires_at')->nullable(); // Wann der Checkout verfällt
+            $table->boolean('converted')->default(false); // Ob erfolgreich abgeschlossen
+            $table->timestamps();
+
+            $table->index(['email', 'reminder_stage']);
+            $table->index(['abandoned_at']);
+            $table->index(['reminded_at']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('abandoned_checkouts');
+    }
+};