feat: reseller self-service portal (clients + licenses + tickets)
- ResellerPortalView with 3 tabs:
1. Kunden: list agency's clients + create new client (POST /api/aos/clients)
2. Lizenzen: list agency-filtered licenses + create new license with
live pricing preview (base + agency discount + yearly discount = net)
3. Tickets: agency-scoped ticket inbox + escalate button
- Top: agency selector (pick which approved reseller to act as)
- Full integration: store, sidebar, top-bar, command-menu, i18n, app-shell
- Mobile responsive, German labels, no indigo/blue
Z User
39b3636333