feat: add product catalogue and product-aware UI

- introduce product catalogue pages, management view entries and shared product composables\n- wire product selection into component/piece flows and machine skeleton requirements\n- display linked product metadata and documents across machine, component and piece views\n- generalize model type tooling to handle PRODUCT category

app/composables/useDocuments.js

@@ -60,6 +60,11 @@ export function useDocuments () {
     return loadFromEndpoint(`/documents/composant/${componentId}`, { updateStore: options.updateStore ?? false })
   }
 
+  const loadDocumentsByProduct = async (productId, options = {}) => {
+    if (!productId) { return { success: false, error: 'Aucun produit sélectionné' } }
+    return loadFromEndpoint(`/documents/product/${productId}`, { updateStore: options.updateStore ?? false })
+  }
+
   const loadDocumentsByPiece = async (pieceId, options = {}) => {
     if (!pieceId) { return { success: false, error: 'Aucune pièce sélectionnée' } }
     return loadFromEndpoint(`/documents/piece/${pieceId}`, { updateStore: options.updateStore ?? false })
@@ -140,6 +145,7 @@ export function useDocuments () {
     loadDocumentsByMachine,
     loadDocumentsByComponent,
     loadDocumentsByPiece,
+    loadDocumentsByProduct,
     uploadDocuments,
     deleteDocument
   }