Replaces the old marketing "guided tour" /demo with a real, fully-functional
catalog browsing experience for the pre-warmed example vehicle. No auth
required, no upstream calls — entirely served from prod DB.
Backend (apps/api/src/demo):
* New @Public() controller exposing five endpoints under /api/demo:
- GET /vehicle → demo vehicle metadata
- GET /categories/tree → top-level category tree
- GET /categories/search?q= → cross-tree search
- GET /categories/:id → getCategoryWithParts (parts+schema+hotspots)
- GET /categories/:id/children → drill children
* DemoService validates every category id against DEMO_VEHICLE_ID before any
downstream service call — the public surface can't be used to read an
arbitrary vehicle's catalog (1-row SELECT, NotFound on miss or wrong owner).
* Vehicle id is env-driven (DEMO_VEHICLE_ID, defaults to the pre-warmed
WVWZZZ1JZ3W597935 — VW Golf 2003 with 277 cats / 9841 parts / 178 schemas
fully drilled in prod).
* Wires CategoriesModule (already exports CategoriesService) — zero new
business logic, just a thin public façade.
Frontend (apps/web):
* /demo (replaces old marketing page): vehicle header + top categories grid
reading /api/demo/* + sticky DemoBanner with sign-up CTA.
* /demo/categories/$categoryId: drill page rendering either a children grid
(parent) or the existing SchemaViewer + parts panel (leaf) — same shape
the dashboard uses, so hotspot overlay, breadcrumb trail, retry on
upstream loadError all just work.
* DemoBanner: sticky top, "Örnek araç: {label} — Kayıt Ol" CTA. The
"Yeni VIN sorgula" explicit paywall trigger lands in a follow-up task.
* PostHog events: demo_loaded (source query-param-aware),
demo_category_clicked, demo_category_detail_viewed, demo_to_register_click
(banner / footer / category_footer placements).
* usePageMeta gains an opt-in `noindex` flag — demo sets it to noindex,follow
for the first 4-6 weeks per spec; cleaned up on unmount so SPA navigation
doesn't carry it to the next route.
Semih Yesilyurt
078076b619