feat: OnyvaLeads customer UI — Suche + Leadspeicher

- New Topbar: logo, 2-tab pill switcher, live "Neu" badge
- /suche page: SearchCard, LoadingCard, ExamplePills
- /leadspeicher page: full leads table with filters, pagination
- StatusBadge, StatusPopover, LeadSidePanel, BulkActionBar
- POST /api/search: unified search entry point → serp-enrich
- Remove Sidebar + old TopBar from layout
- Title: OnyvaLeads, redirect / → /suche

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/page.tsx

@@ -1,5 +1,5 @@
 import { redirect } from "next/navigation";
 
 export default function Home() {
-  redirect("/airscale");
+  redirect("/suche");
 }