Replace the Admin area's ?= query URLs with clean, hierarchical paths that
mirror the breadcrumb:
/admin -> Overview
/admin/config/<category>-> Config / <category>
/admin/tools/ssh-access -> Tools / SSH Access
New /admin (+ /admin*) SPA route -> handleAdmin, which parses the path via the
shared window.adminPath / window.adminCategoryFromPath helpers and renders
through the existing ConfigManager. Legacy /config, /config?=<x> and /ssh now
redirect into the matching /admin path, so old links/bookmarks keep working
(server already serves index.html for any depth). Sidebar, Admin Overview,
dashboard link and top-nav now build /admin paths; active-nav + config data
loading recognise /admin across spa.js, topbar.js, router.js, data-loader.js.
Scope: Admin area only — /app, /apps, /tasks, /backup keep their existing ?=
URLs.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>