refactor: move public static pages

docs/TASKS/app-shell/002-move-public-static-pages.md

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+# Task: Move public static pages
+
+## Goal
+
+Move public marketing/static page code out of `frontend/src/features/landing` into `frontend/src/static` so it is separated from application feature modules.
+
+## Relevant Files
+
+- `frontend/src/router/router.js`
+- `frontend/src/entry-public-ssr.js`
+- `frontend/src/static/**`
+- `docs/SEO.md`
+
+## Validation
+
+```bash
+cd frontend
+npm run build
+```