fix : use custom EnvironmentCreateProcessor to properly add environments

API Platform's default sub-resource POST was replacing instead of adding.
Custom processor with read:false + Link + manual persist fixes this.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Entity/Environment.php

@@ -10,6 +10,7 @@ use ApiPlatform\Metadata\Link;
 use ApiPlatform\Metadata\Patch;
 use ApiPlatform\Metadata\Post;
 use App\Repository\EnvironmentRepository;
+use App\State\EnvironmentCreateProcessor;
 use App\State\MaintenanceToggleProcessor;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
@@ -23,7 +24,9 @@ use Symfony\Component\Serializer\Attribute\Groups;
             uriVariables: [
                 'slug' => new Link(toProperty: 'application', fromClass: Application::class, identifiers: ['slug']),
             ],
+            read: false,
             security: "is_granted('ROLE_ADMIN')",
+            processor: EnvironmentCreateProcessor::class,
         ),
         new Patch(
             security: "is_granted('ROLE_ADMIN')",