feat: implement Hetzner deletion failure notification system with email and messaging support

tests/Unit/HetznerDeletionFailedNotificationTest.php

@@ -0,0 +1,114 @@
+<?php
+
+use App\Notifications\Server\HetznerDeletionFailed;
+use Mockery;
+
+afterEach(function () {
+    Mockery::close();
+});
+
+it('can be instantiated with correct properties', function () {
+    $notification = new HetznerDeletionFailed(
+        hetznerServerId: 12345,
+        teamId: 1,
+        errorMessage: 'Hetzner API error: Server not found'
+    );
+
+    expect($notification)->toBeInstanceOf(HetznerDeletionFailed::class)
+        ->and($notification->hetznerServerId)->toBe(12345)
+        ->and($notification->teamId)->toBe(1)
+        ->and($notification->errorMessage)->toBe('Hetzner API error: Server not found');
+});
+
+it('uses hetzner_deletion_failed event for channels', function () {
+    $notification = new HetznerDeletionFailed(
+        hetznerServerId: 12345,
+        teamId: 1,
+        errorMessage: 'Test error'
+    );
+
+    $mockNotifiable = Mockery::mock();
+    $mockNotifiable->shouldReceive('getEnabledChannels')
+        ->with('hetzner_deletion_failed')
+        ->once()
+        ->andReturn([]);
+
+    $channels = $notification->via($mockNotifiable);
+
+    expect($channels)->toBeArray();
+});
+
+it('generates correct mail content', function () {
+    $notification = new HetznerDeletionFailed(
+        hetznerServerId: 67890,
+        teamId: 1,
+        errorMessage: 'Connection timeout'
+    );
+
+    $mail = $notification->toMail();
+
+    expect($mail->subject)->toBe('Coolify: [ACTION REQUIRED] Failed to delete Hetzner server #67890')
+        ->and($mail->view)->toBe('emails.hetzner-deletion-failed')
+        ->and($mail->viewData['hetznerServerId'])->toBe(67890)
+        ->and($mail->viewData['errorMessage'])->toBe('Connection timeout');
+});
+
+it('generates correct discord content', function () {
+    $notification = new HetznerDeletionFailed(
+        hetznerServerId: 11111,
+        teamId: 1,
+        errorMessage: 'API rate limit exceeded'
+    );
+
+    $discord = $notification->toDiscord();
+
+    expect($discord->title)->toContain('Failed to delete Hetzner server')
+        ->and($discord->description)->toContain('#11111')
+        ->and($discord->description)->toContain('API rate limit exceeded')
+        ->and($discord->description)->toContain('may still exist in your Hetzner Cloud account');
+});
+
+it('generates correct telegram content', function () {
+    $notification = new HetznerDeletionFailed(
+        hetznerServerId: 22222,
+        teamId: 1,
+        errorMessage: 'Invalid token'
+    );
+
+    $telegram = $notification->toTelegram();
+
+    expect($telegram)->toBeArray()
+        ->and($telegram)->toHaveKey('message')
+        ->and($telegram['message'])->toContain('#22222')
+        ->and($telegram['message'])->toContain('Invalid token')
+        ->and($telegram['message'])->toContain('ACTION REQUIRED');
+});
+
+it('generates correct pushover content', function () {
+    $notification = new HetznerDeletionFailed(
+        hetznerServerId: 33333,
+        teamId: 1,
+        errorMessage: 'Network error'
+    );
+
+    $pushover = $notification->toPushover();
+
+    expect($pushover->title)->toBe('Hetzner Server Deletion Failed')
+        ->and($pushover->level)->toBe('error')
+        ->and($pushover->message)->toContain('#33333')
+        ->and($pushover->message)->toContain('Network error');
+});
+
+it('generates correct slack content', function () {
+    $notification = new HetznerDeletionFailed(
+        hetznerServerId: 44444,
+        teamId: 1,
+        errorMessage: 'Permission denied'
+    );
+
+    $slack = $notification->toSlack();
+
+    expect($slack->title)->toContain('Hetzner Server Deletion Failed')
+        ->and($slack->description)->toContain('#44444')
+        ->and($slack->description)->toContain('Permission denied');
+});