feat: implement comprehensive multi-provider payment processing system

- Add unified payment provider architecture with contract-based design
  - Implement 6 payment providers: Stripe, Lemon Squeezy, Polar, Oxapay, Crypto, Activation Keys
  - Create subscription management with lifecycle handling (create, cancel, pause, resume, update)
  - Add coupon system with usage tracking and trial extensions
  - Build Filament admin resources for payment providers, subscriptions, coupons, and trials
  - Implement payment orchestration service with provider registry and configuration management
  - Add comprehensive payment logging and webhook handling for all providers
  - Create customer analytics dashboard with revenue, churn, and lifetime value metrics
  - Add subscription migration service for provider switching
  - Include extensive test coverage for all payment functionality

database/factories/TrialExtensionFactory.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Database\Factories;
+
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends \Illuminate\Database\Eloquent\Factories\Factory<\App\Models\TrialExtension>
+ */
+class TrialExtensionFactory extends Factory
+{
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        $originalEnd = fake()->dateTimeBetween('now', '+14 days');
+        $extensionDays = fake()->numberBetween(1, 30);
+        $newEnd = (new \DateTime($originalEnd->format('Y-m-d')))->modify("+{$extensionDays} days");
+
+        return [
+            'subscription_id' => \App\Models\Subscription::factory(),
+            'user_id' => \App\Models\User::factory(),
+            'extension_days' => $extensionDays,
+            'reason' => fake()->optional(0.7)->randomElement([
+                'Customer request',
+                'Technical issues',
+                'Service outage compensation',
+                'Goodwill gesture',
+                'Payment processing delay',
+            ]),
+            'extension_type' => fake()->randomElement(['manual', 'automatic', 'compensation']),
+            'original_trial_ends_at' => $originalEnd,
+            'new_trial_ends_at' => $newEnd,
+            'granted_at' => fake()->dateTimeBetween('-1 week', 'now'),
+            'granted_by_admin_id' => \App\Models\User::factory(),
+            'metadata' => fake()->optional(0.2)->randomElements([
+                'notes' => fake()->sentence(),
+                'approval_ticket' => fake()->numerify('TCK-#####'),
+            ]),
+        ];
+    }
+}