Initial commit: Converge portfolio rationalization app

Next.js app for mapping a customer's competitive tool landscape onto our
portfolio and building the consolidation business case: assessment
workbench, customer report and Word export, product catalog, competitive
knowledge base, dossier import, shareable landscape questionnaires with a
review inbox, tool-footprint and business-unit value analysis, and an
implementation timeline.

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

src/app/api/catalog/route.ts

@@ -0,0 +1,21 @@
+import { NextResponse } from "next/server";
+import { getCatalog, saveCatalog } from "@/lib/store";
+import type { Catalog } from "@/lib/types";
+
+export async function GET() {
+  return NextResponse.json(await getCatalog());
+}
+
+export async function PUT(req: Request) {
+  const body = (await req.json()) as Catalog;
+  if (!Array.isArray(body?.products) || !Array.isArray(body?.businessUnits)) {
+    return NextResponse.json({ error: "Malformed catalog" }, { status: 400 });
+  }
+  const ids = new Set<string>();
+  for (const p of body.products) {
+    if (!p.id || !p.name) return NextResponse.json({ error: "Product needs an id and a name" }, { status: 400 });
+    if (ids.has(p.id)) return NextResponse.json({ error: `Duplicate product id: ${p.id}` }, { status: 400 });
+    ids.add(p.id);
+  }
+  return NextResponse.json(await saveCatalog(body));
+}