Fix type errors that failed the Docker build

- Cast the transcoder upload body to node:stream/web ReadableStream;
  the DOM ReadableStream type lacks the async-iterator members
  Readable.fromWeb expects
- Exclude transcoder/ and transcoder-remote/ from the root tsconfig:
  they are standalone sub-projects with their own tsconfig and
  dependencies (e.g. archiver) that aren't installed in the root
  node_modules, so next build's typecheck can never resolve them

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/api/transcoder/upload/[videoId]/route.ts

@@ -69,7 +69,9 @@ export async function POST(
 
     // 1. Stream upload body to a temp zip file on disk.
     const nodeReadable = Readable.fromWeb(
-      request.body as ReadableStream<Uint8Array>
+      // DOM ReadableStream and node:stream/web ReadableStream are structurally
+      // different types; fromWeb expects the latter
+      request.body as unknown as import("node:stream/web").ReadableStream<Uint8Array>
     );
     const writeStream = fssync.createWriteStream(tempZipPath);
     await pipeline(nodeReadable, writeStream);