feat(entities) : add description field to Piece and Composant

Add nullable TEXT description column to both pieces and composants
tables with corresponding Doctrine entity mappings, getters/setters
and serialization groups.

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

src/Entity/Composant.php

@@ -55,6 +55,10 @@ class Composant
     #[Groups(['composant:read'])]
     private ?string $reference = null;
 
+    #[ORM\Column(type: Types::TEXT, nullable: true)]
+    #[Groups(['composant:read'])]
+    private ?string $description = null;
+
     #[ORM\Column(type: Types::DECIMAL, precision: 10, scale: 2, nullable: true)]
     #[Groups(['composant:read'])]
     private ?string $prix = null;
@@ -175,6 +179,18 @@ class Composant
         return $this;
     }
 
+    public function getDescription(): ?string
+    {
+        return $this->description;
+    }
+
+    public function setDescription(?string $description): static
+    {
+        $this->description = $description;
+
+        return $this;
+    }
+
     public function getPrix(): ?string
     {
         return $this->prix;

src/Entity/Piece.php

@@ -57,6 +57,10 @@ class Piece
     #[Groups(['piece:read'])]
     private ?string $reference = null;
 
+    #[ORM\Column(type: Types::TEXT, nullable: true)]
+    #[Groups(['piece:read'])]
+    private ?string $description = null;
+
     #[ORM\Column(type: Types::DECIMAL, precision: 10, scale: 2, nullable: true)]
     #[Groups(['piece:read'])]
     private ?string $prix = null;
@@ -177,6 +181,18 @@ class Piece
         return $this;
     }
 
+    public function getDescription(): ?string
+    {
+        return $this->description;
+    }
+
+    public function setDescription(?string $description): static
+    {
+        $this->description = $description;
+
+        return $this;
+    }
+
     public function getPrix(): ?string
     {
         return $this->prix;