썸네일 업로드도 새로운 업로드 방식으로 변경

src/routes/api/upload/[id]/chunks/[index]/+server.ts

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+import { error, text } from "@sveltejs/kit";
+import { Readable } from "stream";
+import { z } from "zod";
+import { authorize } from "$lib/server/modules/auth";
+import { uploadChunk } from "$lib/server/services/upload";
+import type { RequestHandler } from "./$types";
+
+export const POST: RequestHandler = async ({ locals, params, request }) => {
+  const { userId } = await authorize(locals, "activeClient");
+
+  const zodRes = z
+    .object({
+      id: z.uuidv4(),
+      index: z.coerce.number().int().nonnegative(),
+    })
+    .safeParse(params);
+  if (!zodRes.success) error(400, "Invalid path parameters");
+  const { id: uploadId, index: chunkIndex } = zodRes.data;
+
+  // Parse Content-Digest header (RFC 9530)
+  // Expected format: sha-256=:base64hash:
+  const contentDigest = request.headers.get("Content-Digest");
+  if (!contentDigest) error(400, "Missing Content-Digest header");
+
+  const digestMatch = contentDigest.match(/^sha-256=:([A-Za-z0-9+/=]+):$/);
+  if (!digestMatch || !digestMatch[1])
+    error(400, "Invalid Content-Digest format, must be sha-256=:base64:");
+  const encChunkHash = digestMatch[1];
+
+  const contentType = request.headers.get("Content-Type");
+  if (contentType !== "application/octet-stream" || !request.body) {
+    error(400, "Invalid request body");
+  }
+
+  // Convert web ReadableStream to Node Readable
+  const nodeReadable = Readable.fromWeb(
+    request.body as unknown as Parameters<typeof Readable.fromWeb>[0],
+  );
+
+  await uploadChunk(userId, uploadId, chunkIndex, nodeReadable, encChunkHash);
+
+  return text("Chunk uploaded", { headers: { "Content-Type": "text/plain" } });
+};