feat(machine) : afficher quantité pièces + pièces incluses des composants

- MachinePiecesCard : passer isEditMode au PieceItem + forward event update
- useMachineHierarchy : mapper quantity depuis le backend + construire
  les pièces de structure du composant en lecture seule
- useMachineDetailUpdates : PATCH MachinePieceLink.quantity + fix reference null
- ComponentItem : séparer pièces liées / pièces incluses par défaut
- useEntityDocuments : skip chargement documents pour pièces de structure

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

app/components/ComponentItem.vue

@@ -215,14 +215,14 @@
         />
       </div>
 
-      <!-- Component Pieces -->
-      <div v-if="component.pieces && component.pieces.length > 0" class="space-y-2">
+      <!-- Component Pieces (real MachinePieceLinks) -->
+      <div v-if="linkedPieces.length > 0" class="space-y-2">
         <p class="text-xs font-semibold text-base-content/50 uppercase tracking-wide">
           Pièces du composant
         </p>
         <div class="space-y-2">
           <PieceItem
-            v-for="piece in component.pieces"
+            v-for="piece in linkedPieces"
             :key="piece.id"
             :piece="piece"
             :is-edit-mode="isEditMode"
@@ -233,6 +233,21 @@
         </div>
       </div>
 
+      <!-- Structure pieces (read-only, from composant definition) -->
+      <div v-if="structurePieces.length > 0" class="space-y-2">
+        <p class="text-xs font-semibold text-base-content/50 uppercase tracking-wide">
+          Pièces incluses par défaut
+        </p>
+        <div class="space-y-2">
+          <PieceItem
+            v-for="piece in structurePieces"
+            :key="piece.id"
+            :piece="piece"
+            :is-edit-mode="false"
+          />
+        </div>
+      </div>
+
       <!-- Sub Components -->
       <div v-if="childComponents.length > 0" class="space-y-2">
         <p class="text-xs font-semibold text-base-content/50 uppercase tracking-wide">
@@ -341,6 +356,14 @@ const childComponents = computed(() => {
   return Array.isArray(list) ? list : []
 })
 
+// --- Pieces split: real links vs structure definitions ---
+const allPieces = computed(() => {
+  const list = props.component.pieces
+  return Array.isArray(list) ? list : []
+})
+const linkedPieces = computed(() => allPieces.value.filter((p) => !p._structurePiece))
+const structurePieces = computed(() => allPieces.value.filter((p) => p._structurePiece))
+
 // --- Constructeurs ---
 const { constructeurs } = useConstructeurs()
 

app/components/machine/MachinePiecesCard.vue

@@ -28,10 +28,11 @@
         <div v-for="piece in pieces" :key="piece.id">
           <PieceItem
             :piece="piece"
-            :is-edit-mode="false"
+            :is-edit-mode="isEditMode"
             :show-delete="isEditMode"
             :collapse-all="collapsed"
             :toggle-token="collapseToggleToken"
+            @update="$emit('update-piece', $event)"
             @edit="$emit('edit-piece', $event)"
             @delete="$emit('remove-piece', piece.linkId || piece.id)"
           />
@@ -62,6 +63,7 @@ defineProps<{
 
 defineEmits<{
   'toggle-collapse': []
+  'update-piece': [piece: any]
   'edit-piece': [piece: any]
   'add-piece': []
   'remove-piece': [linkId: string]