Shop.CustomPage handles /:slug catch-all for CMS pages. Restructured
router so the catch-all is last — all admin, auth, setup, and SEO
routes defined before the shop scope to prevent interception.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Redirects context with redirect/broken_url schemas, chain flattening,
ETS cache for fast lookups in the request pipeline. BrokenUrlTracker
plug logs 404s. Auto-redirect on product slug change via upsert_product
hook. Admin redirects page with active/broken tabs, manual create form.
RedirectPrunerWorker cleans up old broken URLs. 1227 tests passing.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
