fix: force score=0 for zero-sale products and fix reception SQL sign

- score-engine: add hard guard (wQty=0 && wCa=0 → score=0) before any
  calculation to prevent edge cases (residual margin, percentile rank)
  from producing non-zero scores on unsold articles
- score-engine: set inactivity=24 when product has never sold, so the
  regularityMultiplier penalty (0.3) is correctly applied instead of 1
- pg-ff-client: remove erroneous negation on qte_recue — entry movements
  have positive qtemvt in the DB, negating them produced negative values
  that failed the > 0 check, hiding all entrées in tooltips and modals

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

src/lib/score-engine.ts

@@ -115,6 +115,9 @@ export function computeProductScores(rows: ProductRow[]): ProductRow[] {
             const lastY = parseInt(lastSaleMonth.substring(0, 4));
             const lastM = parseInt(lastSaleMonth.substring(4, 6));
             inactivity = (refY - lastY) * 12 + (refM - lastM);
+        } else if (refMonth && !lastSaleMonth) {
+            // Jamais vendu sur la fenêtre → inactivité maximale
+            inactivity = 24;
         }
 
         return {
@@ -158,6 +161,25 @@ export function computeProductScores(rows: ProductRow[]): ProductRow[] {
         const d = weightedData[idx];
         const r = d.row;
 
+        // --- Guard absolu : aucune vente → score 0, quelle que soit la marge ou le ranking ---
+        if (d.wQty === 0 && d.wCa === 0) {
+            r.avgQtyFournisseur   = avgQty;
+            r.totalFournisseurCa  = totalCa;
+            r.shareQty            = 0;
+            r.shareCa             = 0;
+            r.shareMarge          = 0;
+            const r2z             = r.code2 || "default";
+            const rStat           = rayonTotals.get(r2z);
+            r.avgQtyRayon         = rStat ? rStat.total / rStat.count : 0;
+            r.unitsPerStorePerMonth = 0;
+            r.caPerStorePerYear   = 0;
+            r.score               = 0;
+            r.isRecent            = true;
+            r.isLastProduct       = rows.length === 1;
+            r.isTop30Supplier     = false;
+            continue;
+        }
+
         // --- Métriques de contexte (inchangées, pour l'IA et l'affichage) ---
         r.avgQtyFournisseur = avgQty;
         r.totalFournisseurCa = totalCa;