feat: add custom webhook notification support

Add basic infrastructure for custom webhook notifications:
- Create webhook_notification_settings table with event toggles
- Add WebhookNotificationSettings model with encrypted URL
- Integrate webhook settings into Team model and HasNotificationSettings trait
- Create Livewire component and Blade view for webhook configuration
- Add webhook navigation route and UI

This provides the foundation for sending webhook notifications to custom HTTP/HTTPS endpoints when events occur in Coolify.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/Models/WebhookNotificationSettings.php

@@ -0,0 +1,64 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Notifications\Notifiable;
+
+class WebhookNotificationSettings extends Model
+{
+    use Notifiable;
+
+    public $timestamps = false;
+
+    protected $fillable = [
+        'team_id',
+
+        'webhook_enabled',
+        'webhook_url',
+
+        'deployment_success_webhook_notifications',
+        'deployment_failure_webhook_notifications',
+        'status_change_webhook_notifications',
+        'backup_success_webhook_notifications',
+        'backup_failure_webhook_notifications',
+        'scheduled_task_success_webhook_notifications',
+        'scheduled_task_failure_webhook_notifications',
+        'docker_cleanup_webhook_notifications',
+        'server_disk_usage_webhook_notifications',
+        'server_reachable_webhook_notifications',
+        'server_unreachable_webhook_notifications',
+        'server_patch_webhook_notifications',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'webhook_enabled' => 'boolean',
+            'webhook_url' => 'encrypted',
+
+            'deployment_success_webhook_notifications' => 'boolean',
+            'deployment_failure_webhook_notifications' => 'boolean',
+            'status_change_webhook_notifications' => 'boolean',
+            'backup_success_webhook_notifications' => 'boolean',
+            'backup_failure_webhook_notifications' => 'boolean',
+            'scheduled_task_success_webhook_notifications' => 'boolean',
+            'scheduled_task_failure_webhook_notifications' => 'boolean',
+            'docker_cleanup_webhook_notifications' => 'boolean',
+            'server_disk_usage_webhook_notifications' => 'boolean',
+            'server_reachable_webhook_notifications' => 'boolean',
+            'server_unreachable_webhook_notifications' => 'boolean',
+            'server_patch_webhook_notifications' => 'boolean',
+        ];
+    }
+
+    public function team()
+    {
+        return $this->belongsTo(Team::class);
+    }
+
+    public function isEnabled()
+    {
+        return $this->webhook_enabled;
+    }
+}