v6: boost Imudex-family CATAI results to top in server search (tay nắm/thùng rác/kệ... now lead with Imudex)

index.ts

@@ -837,20 +837,29 @@ async function serverSearchProducts(q: string, limit: number): Promise<any[]> {
   }
   scored.sort((a, b) => b.s - a.s);
   const ranked = scored.slice(0, limit).map(x => formatProduct(x.p, x.p._idx ?? 0));
-  // Weak/no VAIX results (e.g. Imudex-only products like "khóa điện tử") -> merge
-  // Catalogue AI results so chat answers real Imudex products, not unrelated items.
+  // Catalogue AI (Malloca/Imudex/H2) fallback: VAIX lacks Imudex products, so
+  // queries like "khóa điện tử" / "tay nắm" / "thùng rác" must also surface
+  // Imudex items. Merge CATAI hits, then interleave strong CATAI matches to the
+  // top when the query looks like an Imudex-family keyword.
   const cat = await serverSearchCatai(q, limit);
-  if (ranked.length < limit) {
+  if (cat.length) {
     const seen = new Set(ranked.map(r => String(r.sku || "") + String(r.name || "")));
+    const added: any[] = [];
     for (const c of cat) {
       const k = String(c.sku || "") + String(c.name || "");
       if (seen.has(k)) continue;
-      ranked.push(c);
+      added.push(c);
       seen.add(k);
-      if (ranked.length >= limit) break;
+      if (ranked.length + added.length >= limit * 2) break;
     }
+    // Imudex-family keywords: prefer exact CATAI name matches on top of VAIX noise.
+    const fam = /khoa|khoá|kenangha|taynam|banle|ray|thungrac|giag|giatri|giavi|ke[ -]?gia|ke[ -]?xi|ke[ -]?dao|ke[ -]?chen|ke[ -]?bat|ke[ -]?xoong|dia|chen|bat|combo|lock|smart/i.test(qNorm);
+    const boosted = added.filter(c => fam);
+    const rest = added.filter(c => !fam);
+    for (const c of boosted) ranked.unshift(c);
+    for (const c of rest) ranked.push(c);
   }
-  return ranked;
+  return ranked.slice(0, limit);
 }
 // Derive a coarse product family from the product NAME for diverse combos.
 function serverItemFamily(p: any): string {