feat(api): alias /v1/multimodal-embeddings to /v1/embeddings (#10568)

Jina-compatible clients POST /v1/multimodal-embeddings and currently get
HTTP 404 unknown_route from the catch-all.

Co-authored-by: Ravi Tharuma <RaviTharuma@users.noreply.github.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

src/shared/constants/endpointCategories.ts

@@ -34,7 +34,7 @@ export const ENDPOINT_CATEGORIES: readonly EndpointCategory[] = [
     id: "embeddings",
     label: "Embeddings",
     description: "Text embeddings generation",
-    prefixes: ["/v1/embeddings"],
+    prefixes: ["/v1/embeddings", "/v1/multimodal-embeddings"],
   },
   {
     id: "images",