fix(search) : disable client-side filtering when server-search is active

SearchSelect was filtering results client-side on label only, hiding
server results matched by reference. Add serverSearch prop to bypass
client filter when the API already handles search.

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

app/components/ComponentStructureAssignmentNode.vue

@@ -23,6 +23,7 @@
           :empty-text="componentOptions.length ? 'Aucun résultat' : 'Aucun composant disponible'"
           :option-label="componentOptionLabel"
           :option-description="componentOptionDescription"
+          server-search
           @search="fetchComponentOptions"
           @update:modelValue="(value) => { assignment.selectedComponentId = normalizeSelectionValue(value); }"
         />
@@ -62,6 +63,7 @@
           :empty-text="getPieceOptions(pieceAssignment).length ? 'Aucun résultat' : 'Aucune pièce disponible'"
           :option-label="pieceOptionLabel"
           :option-description="pieceOptionDescription"
+          server-search
           @search="(term) => fetchPieceOptions(pieceAssignment, term)"
           @update:modelValue="(value) => { pieceAssignment.selectedPieceId = normalizeSelectionValue(value); }"
         />
@@ -101,6 +103,7 @@
           :empty-text="getProductOptions(productAssignment).length ? 'Aucun résultat' : 'Aucun produit disponible'"
           :option-label="productOptionLabel"
           :option-description="productOptionDescription"
+          server-search
           @search="(term) => fetchProductOptions(productAssignment, term)"
           @update:modelValue="(value) => { productAssignment.selectedProductId = normalizeSelectionValue(value); }"
         />