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/Machine.php

@@ -53,10 +53,6 @@ class Machine
     #[ORM\JoinColumn(name: 'siteId', referencedColumnName: 'id', nullable: false, onDelete: 'CASCADE')]
     private Site $site;
 
-    #[ORM\ManyToOne(targetEntity: TypeMachine::class, inversedBy: 'machines')]
-    #[ORM\JoinColumn(name: 'typeMachineId', referencedColumnName: 'id', nullable: true)]
-    private ?TypeMachine $typeMachine = null;
-
     /**
      * @var Collection<int, Constructeur>
      */
@@ -92,6 +88,12 @@ class Machine
     #[ORM\OneToMany(mappedBy: 'machine', targetEntity: Document::class)]
     private Collection $documents;
 
+    /**
+     * @var Collection<int, CustomField>
+     */
+    #[ORM\OneToMany(mappedBy: 'machine', targetEntity: CustomField::class, cascade: ['persist', 'remove'])]
+    private Collection $customFields;
+
     /**
      * @var Collection<int, CustomFieldValue>
      */
@@ -111,6 +113,7 @@ class Machine
         $this->pieceLinks        = new ArrayCollection();
         $this->productLinks      = new ArrayCollection();
         $this->documents         = new ArrayCollection();
+        $this->customFields      = new ArrayCollection();
         $this->customFieldValues = new ArrayCollection();
     }
 
@@ -192,14 +195,31 @@ class Machine
         return $this;
     }
 
-    public function getTypeMachine(): ?TypeMachine
+    /**
+     * @return Collection<int, CustomField>
+     */
+    public function getCustomFields(): Collection
     {
-        return $this->typeMachine;
+        return $this->customFields;
     }
 
-    public function setTypeMachine(?TypeMachine $typeMachine): static
+    public function addCustomField(CustomField $customField): static
     {
-        $this->typeMachine = $typeMachine;
+        if (!$this->customFields->contains($customField)) {
+            $this->customFields->add($customField);
+            $customField->setMachine($this);
+        }
+
+        return $this;
+    }
+
+    public function removeCustomField(CustomField $customField): static
+    {
+        if ($this->customFields->removeElement($customField)) {
+            if ($customField->getMachine() === $this) {
+                $customField->setMachine(null);
+            }
+        }
 
         return $this;
     }