feat: add dedicated notifications page

Replace the bell popover with an RTL notification inbox, inline Markdown details, read filters, and explicit destination and delete actions. Remove retired email-link screens and client calls.

README.md

@@ -31,7 +31,7 @@ The production runtime serves on port `3000` inside Docker. Dockerfiles live onl
 
 ## Routes
 - Public SEO pages: `/`, `/about`, `/blog`, `/blog/[slug]`, `/events`, `/events/[slug]`
-- Client-heavy flows: `/auth`, `/profile`, `/logout`, `/payments/result`, `/reset-password/*`, `/verify-email/*`
+- Client-heavy flows: `/auth`, `/profile`, `/notifications`, `/logout`, `/payments/result`, `/reset-password`
 - Admin: `/admin/*`
 
 ## Validation