feat(detail) : add consultation pages for piece, composant, product

Add read-only detail pages with edit/view toggle for piece, composant and
product, matching the existing machine detail pattern. Empty fields and
documents section are hidden in consultation mode. Catalogs and cross-links
updated to point to the new detail pages.

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

app/components/PieceItem.vue

@@ -180,7 +180,7 @@
             </p>
             <NuxtLink
               v-if="selectedProduct.id"
-              :to="`/product/${selectedProduct.id}/edit`"
+              :to="`/product/${selectedProduct.id}`"
               class="link link-primary text-xs"
             >
               Ouvrir la fiche produit