feat(worker): upload status in the job log, ProRes uploaded in the background

Preview jobs looked stuck after aerender finished: the worker was silently
uploading the review MP4s and the ProRes MOV over a slow uplink, and a
restart mid-upload threw the preview away.

- Worker 1.7.1 replaces the job's log tail with live upload status and logs
  each upload's size, duration and speed.
- The ProRes MOV now uploads after finalize via a persistent queue
  (HighResUploader, resumes after restart, 5 attempts) and attaches through
  the new E13b endpoint POST /api/ext/render/jobs/{id}/attach-highres.
  A MOV from a superseded preview is discarded.

Deploy the server before the 1.7.1 worker.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/api/ext/render/jobs/[jobId]/attach-highres/route.ts

@@ -0,0 +1,38 @@
+import { NextRequest, NextResponse } from "next/server";
+import { isExtAuthorized } from "@/lib/render-pipeline/ext-auth";
+import { toErrorResponse } from "@/lib/render-pipeline/errors";
+import { attachHighRes, type AttachHighResInput } from "@/lib/render-pipeline/preview";
+
+// ── POST /api/ext/render/jobs/{jobId}/attach-highres (E13b) ──────────────────
+//
+// The preview's ProRes MOV, uploaded in the background after finalize (worker
+// ≥ 1.7.1). Attaches it to the version as its High Res download, or records on
+// the export timeline that the upload failed.
+
+export async function POST(
+  req: NextRequest,
+  { params }: { params: Promise<{ jobId: string }> }
+) {
+  if (!isExtAuthorized(req)) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+  const { jobId } = await params;
+
+  let body: AttachHighResInput & { machineId?: string };
+  try {
+    body = await req.json();
+  } catch {
+    return NextResponse.json({ error: "Invalid JSON" }, { status: 400 });
+  }
+  if (!body.machineId) {
+    return NextResponse.json({ error: "machineId is required" }, { status: 400 });
+  }
+
+  try {
+    const result = await attachHighRes(jobId, body.machineId, body);
+    return NextResponse.json(result);
+  } catch (err) {
+    const { body: errBody, status } = toErrorResponse(err);
+    return NextResponse.json(errBody, { status });
+  }
+}