The brand catalog is the generated homarr-labs dashboard-icons manifest,
which carries no Homelable mark, so a user cannot label the app itself on
a canvas. Serve a small set of logos from `public/brand/` instead: the
picker prepends `LOCAL_BRAND_ICONS` to the manifest and `brandIconUrl`
routes those slugs at the local asset rather than the jsDelivr CDN.
`dashboardIcons.json` stays untouched — `scripts/fetch-dashboard-icons.mjs`
overwrites it wholesale.
Closes part of #397 (the Docker host polling request is untouched).
ha-relevant: yes
Pouzor
3cbda60277
