refactor: unify media understanding pipeline

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

@@ -0,0 +1,7 @@
+import type { MediaUnderstandingProvider } from "../../types.js";
+import { describeImageWithModel } from "../image.js";
+
+export const anthropicProvider: MediaUnderstandingProvider = {
+  id: "anthropic",
+  describeImage: describeImageWithModel,
+};