docs: update ROADMAP and README with recent features

- Add Mobile Bottom Navigation section to ROADMAP
- Update routes table in README (collections routes)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -106,7 +106,8 @@ assets/css/
 | Path | Description |
 |------|-------------|
 | `/` | Shop home page |
-| `/products` | Products listing |
+| `/collections/all` | All products |
+| `/collections/:slug` | Category collection (filterable) |
 | `/products/:id` | Product detail page |
 | `/cart` | Shopping cart |
 | `/about` | About page |