Template
## Summary - Closes #9. Port shop-gated buyer accounts (register/login/profile, password reset, order history), purchase-gated reviews, and Stripe customer ids. Cards stay on Stripe. - Slim public contact form to email + interest + message. Shipping tracking status, scan events, paste-in numbers, and EasyPost webhook when FEATURE_SHIPPING is on. - Add template-neutral `seed_demo` (generic SKUs, demo shoppers, guest orders, tracking stubs). Prod refused. `--reset` deletes tagged demo rows after invoices. ## Test plan - [ ] `cd site && uv run python manage.py test` (173 tests passed locally) - [ ] Shop on: `/account/register`, login, profile, password reset, claim guest orders by email - [ ] Shop off: `/account/` URLs absent; Sign in / Account links hidden - [ ] Checkout as logged-in buyer stores `Order.user` and Stripe customer id; product review only after paid purchase - [ ] Shipping on: portal paste-in tracking + EasyPost webhook updates status; shipping off: orders still work without tracking UI - [ ] `seed_demo` refused in prod; `--reset` rebuilds tagged catalog/shoppers without deleting staff invoices Reviewed-on: #10