Reorganize the admin sidebar into Overview / Content / Automation /
Users / System so media pipeline tools no longer hide under Users and
Settings is not buried in a seven-item Server grab-bag. Group the flat
13-tab admin settings page into Server / Media / Connections / Data
sections, and split the Integrations tab into dedicated Subtitles
(search providers + AI translation) and Watch Providers (Trakt/Simkl
OAuth) pages, leaving Integrations for one-off keys like MDBList. All
routes and ?tab= ids are unchanged so deep links keep working.
Extract the shared grouped-rail markup used by the admin sidebar, admin
settings nav, and user settings nav into a SideNav component, and
remove the orphaned admin-settings PluginsSettings page (superseded by
/admin/plugins).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
