perf: replace N ranking API calls with 1 bulk fetch per supplier

getRankingByArticles now uses GET /api/ranking?foucentrale=<code>
to fetch all rankings for a supplier in a single request instead of
making one request per article. For a 500-article supplier this goes
from ~500 HTTP calls to 2 (count + bulk), eliminating the timeout
that caused the client-side crash on large suppliers.

Falls back to per-article requests if no codeFournisseur is provided
or if the bulk endpoint fails.

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

src/features/grid/api/get-product-rows.ts

@@ -35,7 +35,7 @@ export async function getProductRows(input: GetProductRowsInput): Promise<Produc
             getMensuelByArticles(articles, dateDebut, dateFin),
             getReferentielByArticles(articles),
             getCommandesByFournisseur(codeFournisseur),
-            getRankingByArticles(articles),
+            getRankingByArticles(articles, codeFournisseur),
         ]);
         const { rankings: rankingMap, totalRankedProducts } = rankingResult;
         console.log(`[getProductRows] mensuel data for ${mensuelMap.size}/${articles.length} articles`);