feat(docver): add document versioning API (docx+pdf in MinIO)

Stand-alone API group at /api/documents/{docId}/versions — one document
per docId (unique), each version stores .docx + optional .pdf as MinIO
objects with uploader userId/userName/createdAt (no auth, like
api/template; callers identify themselves per docs/PLAN-DOCVER.md).

- POST versions (multipart): validates fields/magic bytes/100MB cap,
  uploads to MinIO first, cleans up objects if the DB insert fails;
  returns {hasPdf, versionId, versionNumber} with server-authoritative
  numbering (tx: upsert + SELECT FOR UPDATE, safe under parallel calls)
- GET versions: DocumentVersionDTO[] newest-first (404 for unknown docId)
- GET versions/{versionId}/download-link?format=docx|pdf: presigned URL
  (docId+versionId matched together; pdf-missing = 404)
- tables documents/document_versions + migration drizzle/0005
- docker-compose.yml: judes-note-db + judes-note-minio (quay.io image,
  host ports 19000/19001, POSTGRES_DB ecourt-note, pinned volume names)
- lib/openapi.ts: documents tag + paths for Swagger UI
- middleware: exempt api/documents from login redirect
- unit tests tests/lib/document-versioning.test.ts (23 cases)

wordaddin untouched — swap the mock later via NEXT_PUBLIC_ADDIN_API_BASE_URL.

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

app/api/documents/[docId]/versions/[versionId]/download-link/route.ts

@@ -0,0 +1,48 @@
+// PLAN-DOCVER.md §1 — GET /api/documents/{docId}/versions/{versionId}/download-link?format=docx|pdf
+// คืน presigned URL อายุสั้น (env DOCVER_LINK_TTL_SECONDS) ให้ UI เปิดในเบราว์เซอร์จริง
+// ของผู้ใช้ — เช็คทั้ง docId และ versionId พร้อมกันกันโยน id ข้ามเอกสาร
+import {
+  docverError,
+  parseDocId,
+  parseDownloadFormat,
+  parseVersionIdParam,
+} from "@/lib/document-versioning";
+import { findVersionForDoc, presignVersionUrl } from "@/lib/docver-store";
+
+export const runtime = "nodejs";
+export const dynamic = "force-dynamic";
+
+export async function GET(
+  request: Request,
+  { params }: { params: { docId: string; versionId: string } },
+) {
+  const docId = parseDocId(params.docId);
+  if (!docId.ok) return docverError(docId.error, 400);
+  const versionId = parseVersionIdParam(params.versionId);
+  if (!versionId.ok) return docverError(versionId.error, 400);
+  let format: string | null = null;
+  try {
+    format = new URL(request.url).searchParams.get("format");
+  } catch {
+    return docverError("URL ของ request ไม่ถูกต้อง", 400);
+  }
+  const parsedFormat = parseDownloadFormat(format);
+  if (!parsedFormat.ok) return docverError(parsedFormat.error, 400);
+
+  try {
+    const row = await findVersionForDoc(docId.docId, versionId.versionId);
+    if (!row) {
+      return docverError("ไม่พบ version นี้ของเอกสาร", 404);
+    }
+    if (parsedFormat.format === "pdf" && row.pdfObjectKey === null) {
+      return docverError("version นี้ไม่มีสำเนา PDF", 404);
+    }
+    const link = await presignVersionUrl(row.id, parsedFormat.format);
+    return new Response(JSON.stringify(link), {
+      headers: { "content-type": "application/json; charset=utf-8" },
+    });
+  } catch (err) {
+    console.error("docver: สร้าง download link ล้ม", err);
+    return docverError("เกิดข้อผิดพลาดของระบบ โปรดลองใหม่อีกครั้ง", 500);
+  }
+}