refactor: unify media understanding pipeline

src/media-understanding/providers/openai/index.ts

@@ -1,7 +1,9 @@
 import type { MediaUnderstandingProvider } from "../../types.js";
+import { describeImageWithModel } from "../image.js";
 import { transcribeOpenAiCompatibleAudio } from "./audio.js";
 
 export const openaiProvider: MediaUnderstandingProvider = {
   id: "openai",
+  describeImage: describeImageWithModel,
   transcribeAudio: transcribeOpenAiCompatibleAudio,
 };