feat: add scoped document API and resumable batch uploader

apps/docs/src/pages/api/documents/batch.ts

@@ -0,0 +1,22 @@
+import type { NextApiRequest, NextApiResponse } from "next";
+import { DocumentValidationError, saveDocumentBatch } from "@/lib/docs";
+import { authorizeDocuments, documentApiError, idempotency, parseDocument } from "@/lib/documents-api";
+
+export const config = { api: { bodyParser: { sizeLimit: "8mb" } } };
+export default function handler(request: NextApiRequest, response: NextApiResponse) {
+  try {
+    const key = authorizeDocuments(request, response, true);
+    if (!key) return;
+    if (request.method !== "POST") {
+      response.setHeader("Allow", "POST");
+      return response.status(405).end();
+    }
+    const body = request.body;
+    if (!body || typeof body !== "object" || Array.isArray(body) ||
+        Object.keys(body).length !== 1 || !Array.isArray(body.documents) ||
+        !body.documents.length || body.documents.length > 100)
+      throw new DocumentValidationError("Expected { documents: [...] } with 1 to 100 documents");
+    const documents = body.documents.map((row: unknown) => parseDocument(row));
+    return response.status(200).json(saveDocumentBatch(documents, idempotency(request, key.id)));
+  } catch (error) { return documentApiError(response, error); }
+}