- server.go: GET /storage (Tárhely page), GET /settings/notifications
(GET->page, POST->save dispatch on the same path), GET
/settings/security; the enrollment wizards move to /storage/init +
/storage/attach with 301s from the old /settings/storage/* URLs.
- handlers.go: settingsData() decomposed into settingsBaseData +
systemPageData / storagePageData / notificationsPageData /
securityPageData; the legacy merge remains only while the monolithic
settings.html exists (Part 2 deletes it). All five storage action
redirects (add/remove/default/schedulable/label) now land on
/storage?storage_msg=... (incl. the two error-branch redirects).
- Every page keeps rendering the full legacy template in this commit —
the site stays functional; the split lands in Part 2.
- Tests: four pages 200, wizard 301s + new URLs render, storage-label
redirect Location prefix + flash renders on /storage, wrong-password
inline re-render. Red-proven vs pre-split code (Location was
/settings?..., no 301s).
