Fix og:image for bigsale SEO links — load from catalog

index.ts

@@ -260,7 +260,14 @@ async function serveProductOG(req: Request): Promise<Response> {
       if (bsProd) {
         const bsName = esc(bsProd.name || bsProd.code || "Sản phẩm BIG SALE");
         const bsPrice = Number(String(bsProd.bigsale || "").replace(/\./g, "")) || 0;
-        const bsImgRaw = bsProd.image || "";
+        let bsImgRaw = bsProd.image || "";
+        if (!bsImgRaw) {
+          const codeNorm = String(bsProd.code || "").trim().toUpperCase().replace(/\s+/g, " ");
+          if (typeof allProducts !== "undefined" && Array.isArray(allProducts)) {
+            const catProd = allProducts.find(function(x: any){ const sku=String(x.sku||x.model||x.slug||"").trim().toUpperCase().replace(/\s+/g," "); return sku===codeNorm || String(x.title_clean||x.name||"").toUpperCase().replace(/\s+/g," ").indexOf(codeNorm)>=0; });
+            if (catProd && catProd.image) bsImgRaw = catProd.image;
+          }
+        }
         const bsImg = bsImgRaw ? escURL(bsImgRaw) : fallbackImg;
         const ogTitle = "🔥 BIG SALE: " + bsName + (bsPrice > 0 ? " - " + Number(bsPrice).toLocaleString("vi-VN") + "₫" : "") + " | V.AI STUDIO";
         const ogDesc = (bsPrice > 0 ? "Giá BIG SALE " + bsName + " chỉ còn " + Number(bsPrice).toLocaleString("vi-VN") + "₫" : "Chương trình BIG SALE V.AI STUDIO") + " | Giảm " + esc("-" + (bsProd.discount || "0%"));