refactor(api) : remove TypeMachine skeleton system, fix ModelType serialization

- Remove TypeMachine, TypeMachineComponentRequirement, TypeMachinePieceRequirement,
  TypeMachineProductRequirement entities and related repositories/state processor
- Replace MachineSkeletonController with MachineStructureController
- Link CustomField directly to Machine instead of TypeMachine
- Add migration to drop TypeMachine tables and migrate custom fields to machines
- Fix ModelType serialization: Annotation\Groups → Attribute\Groups (Symfony 8 compat)
  and add product:read, composant:read, piece:read groups for embedded category display
- Fix Profile: same Annotation → Attribute import
- Fix SearchFilter: partial → ipartial on Comment and Document
- Update frontend submodule (remove skeleton pages/components, simplify machine creation)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/Entity/Document.php

@@ -24,7 +24,7 @@ use Symfony\Component\Serializer\Attribute\Groups;
 #[ORM\Entity(repositoryClass: DocumentRepository::class)]
 #[ORM\Table(name: 'documents')]
 #[ORM\HasLifecycleCallbacks]
-#[ApiFilter(SearchFilter::class, properties: ['name' => 'partial', 'filename' => 'partial'])]
+#[ApiFilter(SearchFilter::class, properties: ['name' => 'ipartial', 'filename' => 'ipartial'])]
 #[ApiFilter(ExistsFilter::class, properties: ['site', 'machine', 'composant', 'piece', 'product'])]
 #[ApiFilter(OrderFilter::class, properties: ['createdAt', 'name', 'size'])]
 #[ApiResource(