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/Team.php

@@ -54,6 +54,7 @@ class Team extends Model implements SendsDiscord, SendsEmail, SendsPushover, Sen
             $team->slackNotificationSettings()->create();
             $team->telegramNotificationSettings()->create();
             $team->pushoverNotificationSettings()->create();
+            $team->webhookNotificationSettings()->create();
         });
 
         static::saving(function ($team) {
@@ -307,4 +308,9 @@ class Team extends Model implements SendsDiscord, SendsEmail, SendsPushover, Sen
     {
         return $this->hasOne(PushoverNotificationSettings::class);
     }
+
+    public function webhookNotificationSettings()
+    {
+        return $this->hasOne(WebhookNotificationSettings::class);
+    }
 }