feat(api): implement new API routes for bulk category updates, inventory consumption, and product management with authentication

frontend/app/api/admin/inventory-item/route.ts

@@ -0,0 +1,30 @@
+import { NextResponse } from 'next/server';
+import { auth } from '../../../../auth';
+
+const API_BASE = process.env.NEXT_PUBLIC_API_URL_INTERNAL || 'http://recipe-api:8080';
+
+export async function POST(req: Request) {
+  const session = await auth();
+  if (!session?.accessToken) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
+  }
+
+  const body = await req.json();
+
+  const res = await fetch(`${API_BASE}/api/inventory`, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+      Authorization: `Bearer ${session.accessToken}`,
+    },
+    body: JSON.stringify(body),
+    cache: 'no-store',
+  });
+
+  if (!res.ok) {
+    const text = await res.text();
+    return NextResponse.json({ error: text || 'Kunde inte skapa inventory-rad' }, { status: res.status });
+  }
+
+  return NextResponse.json({ ok: true });
+}