fix: enforce brand matching for references

app/api/agent-workflow/reference-search/route.ts

@@ -42,6 +42,9 @@ type ExternalTaskDetailCandidate = {
   brand?: string;
   productBrand?: string;
   brand_name?: string;
+  brand_name_cn?: string;
+  brandTitle?: string;
+  brand_title?: string;
   categoryName?: string;
   shopName?: string;
   sceneName?: string;
@@ -64,6 +67,10 @@ type ExternalTaskDetailResponse = {
     brandName?: string | null;
     brand?: string | null;
     productBrand?: string | null;
+    brand_name?: string | null;
+    brand_name_cn?: string | null;
+    brandTitle?: string | null;
+    brand_title?: string | null;
     categoryName?: string | null;
     shopName?: string | null;
     candidateCount?: number;
@@ -97,6 +104,29 @@ function normalizeUrlList(value: unknown) {
   ).slice(0, 64);
 }
 
+function getExternalBrandName(value: {
+  brandName?: string | null;
+  brand?: string | null;
+  productBrand?: string | null;
+  brand_name?: string | null;
+  brand_name_cn?: string | null;
+  brandTitle?: string | null;
+  brand_title?: string | null;
+}) {
+  return (
+    String(
+      value.brandName ||
+        value.brand ||
+        value.productBrand ||
+        value.brand_name ||
+        value.brand_name_cn ||
+        value.brandTitle ||
+        value.brand_title ||
+        ""
+    ).trim() || null
+  );
+}
+
 function mapUpstreamErrorStatus(code: string) {
   if (
     code === "SKU_NOT_FOUND" ||
@@ -117,21 +147,15 @@ function mapUpstreamErrorStatus(code: string) {
 
 function normalizeCandidate(
   value: ExternalTaskDetailCandidate,
-  index: number
+  index: number,
+  fallbackBrandName?: string | null
 ): AgentModeReferenceCandidate {
   const uploadedAt = String(value.uploadedAt || "").trim() || null;
   const taskNo = String(value.taskNo || "").trim() || null;
   const materialId = String(value.materialId || "").trim() || null;
   const sceneName = String(value.sceneName || "").trim() || null;
   const id = taskNo || materialId || `candidate-${index + 1}`;
-  const brandName =
-    String(
-      value.brandName ||
-        value.brand ||
-        value.productBrand ||
-        value.brand_name ||
-        ""
-    ).trim() || null;
+  const brandName = getExternalBrandName(value) || fallbackBrandName || null;
 
   return {
     id,
@@ -224,13 +248,6 @@ function filterCandidatesByBrand(
   const normalizedRequestedBrand = normalizeComparableName(brandName);
   if (!normalizedRequestedBrand) return candidates;
 
-  const hasBrandMetadata = candidates.some((candidate) =>
-    Boolean(normalizeComparableName(candidate.brandName))
-  );
-  if (!hasBrandMetadata) {
-    return candidates;
-  }
-
   return candidates.filter((candidate) =>
     isCandidateMatchedBrand(candidate, normalizedRequestedBrand)
   );
@@ -267,11 +284,17 @@ export async function GET(request: NextRequest) {
 
     const normalizedKeyword = parsed.keyword.trim().toUpperCase();
     const queryType = parsed.queryType as AgentWorkflowMaterialQueryType;
+    const requestedBrandName = String(parsed.brandName || "").trim();
+    const upstreamParams = new URLSearchParams({
+      resourceType: "task-detail",
+      [queryType]: normalizedKeyword,
+    });
+    if (requestedBrandName) {
+      upstreamParams.set("brandName", requestedBrandName);
+    }
     const upstreamUrl = `${normalizeBaseUrl(
       config.baseUrl
-    )}/standard-model-white-background?resourceType=task-detail&${queryType}=${encodeURIComponent(
-      normalizedKeyword
-    )}`;
+    )}/standard-model-white-background?${upstreamParams.toString()}`;
 
     const upstreamResponse = await fetch(upstreamUrl, {
       method: "GET",
@@ -299,9 +322,11 @@ export async function GET(request: NextRequest) {
       );
     }
 
-    const requestedBrandName = String(parsed.brandName || "").trim();
+    const upstreamBrandName = getExternalBrandName(upstreamResult.data);
     const sortedCandidates = sortCandidatesByUploadedAtDesc(
-      (upstreamResult.data.candidates || []).map((item, index) => normalizeCandidate(item, index))
+      (upstreamResult.data.candidates || []).map((item, index) =>
+        normalizeCandidate(item, index, upstreamBrandName)
+      )
     );
     const normalizedCandidates = filterCandidatesByBrand(sortedCandidates, requestedBrandName)
       .filter((candidate) => getRenderableCandidateTargetUrls(candidate, parsed.target).length > 0);
@@ -353,12 +378,7 @@ export async function GET(request: NextRequest) {
         matchedSku: String(upstreamResult.data.sku || "").trim() || null,
         brandName:
           selectedCandidate.brandName ||
-          String(
-            upstreamResult.data.brandName ||
-              upstreamResult.data.brand ||
-              upstreamResult.data.productBrand ||
-              ""
-          ).trim() ||
+          upstreamBrandName ||
           requestedBrandName ||
           null,
         categoryName: selectedCandidate.categoryName || String(upstreamResult.data.categoryName || "").trim() || null,