fix: route WeKnora embed through backend prefix

frontend-web/src/strategy-components/components/resource-management/llmwiki/WeKnoraKnowledgeDetailPage.tsx

@@ -55,6 +55,23 @@ function postThemeToFrame(frame: HTMLIFrameElement | null) {
   frame.contentWindow.postMessage(collectThemePayload(), targetOrigin);
 }
 
+const WEKNORA_BACKEND_PREFIX = "/deerflow";
+
+function buildFrameUrl(framePath: string) {
+  const backendBase = getBackendBaseURL().replace(/\/+$/, "");
+  const backendOrigin = backendBase
+    ? new URL(backendBase, window.location.origin).origin
+    : window.location.origin;
+  if (/^https?:\/\//i.test(framePath)) return new URL(framePath);
+  if (framePath.startsWith("/")) {
+    const path = !framePath.startsWith(`${WEKNORA_BACKEND_PREFIX}/`)
+      ? `${WEKNORA_BACKEND_PREFIX}${framePath}`
+      : framePath;
+    return new URL(path, backendOrigin);
+  }
+  return new URL(`${backendBase || backendOrigin}/${framePath.replace(/^\/+/, "")}`);
+}
+
 export function WeKnoraKnowledgeDetailPage() {
   const {
     knowledge_base_id: strategyKnowledgeBaseId,
@@ -88,15 +105,7 @@ export function WeKnoraKnowledgeDetailPage() {
       .then((session) => {
         if (cancelled) return;
         const framePath = session.frame_path || "";
-        const backendBase = getBackendBaseURL().replace(/\/+$/, "");
-        const backendOrigin = backendBase
-          ? new URL(backendBase, window.location.origin).origin
-          : window.location.origin;
-        const nextUrl = /^https?:\/\//i.test(framePath)
-          ? new URL(framePath)
-          : framePath.startsWith("/")
-            ? new URL(framePath, backendOrigin)
-            : new URL(`${backendBase || backendOrigin}/${framePath.replace(/^\/+/, "")}`);
+        const nextUrl = buildFrameUrl(framePath);
         nextUrl.searchParams.set("theme", collectThemePayload().theme);
         setFrameSrc(nextUrl.toString());
       })