fix(api): improve scheduled tasks validation and delete logic

- Use explicit has() checks for timeout and enabled fields to properly handle falsy values
- Add validation to prevent empty update requests
- Optimize delete endpoint to use direct query deletion instead of fetch-then-delete
- Update factory to use Team::factory() for proper test isolation

database/factories/ScheduledTaskFactory.php

@@ -2,6 +2,7 @@
 
 namespace Database\Factories;
 
+use App\Models\Team;
 use Illuminate\Database\Eloquent\Factories\Factory;
 
 class ScheduledTaskFactory extends Factory
@@ -14,7 +15,7 @@ class ScheduledTaskFactory extends Factory
             'frequency' => '* * * * *',
             'timeout' => 300,
             'enabled' => true,
-            'team_id' => 1,
+            'team_id' => Team::factory(),
         ];
     }
 }