feat(comments) : add file attachments on comments

Comments can now have documents attached via multipart/form-data upload.
New endpoint GET /api/documents/comment/{id} to list a comment's files.
Document entity gains a comment relation with cascade remove.

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

src/Entity/Document.php

@@ -28,7 +28,7 @@ use Symfony\Component\Serializer\Attribute\Groups;
 #[ORM\Table(name: 'documents')]
 #[ORM\HasLifecycleCallbacks]
 #[ApiFilter(SearchFilter::class, properties: ['name' => 'ipartial', 'filename' => 'ipartial'])]
-#[ApiFilter(ExistsFilter::class, properties: ['site', 'machine', 'composant', 'piece', 'product'])]
+#[ApiFilter(ExistsFilter::class, properties: ['site', 'machine', 'composant', 'piece', 'product', 'comment'])]
 #[ApiFilter(OrderFilter::class, properties: ['createdAt', 'name', 'size'])]
 #[ApiResource(
     description: 'Documents et fichiers. Gestion des fichiers joints (PDF, images, etc.) rattachés aux machines, pièces, composants, produits ou sites. Upload via multipart/form-data.',
@@ -108,6 +108,11 @@ class Document
     #[Groups(['document:list'])]
     private ?Site $site = null;
 
+    #[ORM\ManyToOne(targetEntity: Comment::class, inversedBy: 'documents')]
+    #[ORM\JoinColumn(name: 'comment_id', referencedColumnName: 'id', nullable: true, onDelete: 'CASCADE')]
+    #[Groups(['document:list'])]
+    private ?Comment $comment = null;
+
     #[ORM\Column(type: Types::STRING, length: 20, enumType: DocumentType::class)]
     #[Groups(['document:list', 'document:read', 'composant:read', 'piece:read', 'product:read'])]
     private DocumentType $type = DocumentType::DOCUMENTATION;
@@ -256,4 +261,16 @@ class Document
 
         return $this;
     }
+
+    public function getComment(): ?Comment
+    {
+        return $this->comment;
+    }
+
+    public function setComment(?Comment $comment): static
+    {
+        $this->comment = $comment;
+
+        return $this;
+    }
 }