feat: add Poland (.pl) as the eighth country scope
Promote pl from brand-kit-only to a full build scope. National atproto.pl site in EN/PL, grey/red flag lockup (white band -> grey, the reverse of .ch red/grey, so the pair stays distinct); the UI leads with grey, not red, per the UI-accent rule. Not a community verifier (no /verify page). - scopes.ts: pl scope (social @atproto.pl did:plc:524l67hpuzkx2fn573rgxpqk, six cities, en/pl endonyms, no local maintainer yet) - i18n: full Polish UI catalogue (machine-translated, pending native review, as with .it/.de), pl market overrides, REGION/IN_COUNTRY/ENDONYM/OG_LOCALE - communities.ts: national atproto.pl directory entry - community-size.astro: Polish page title + description - deploy.yml: build and publish pl to the atprotopl-website Codeberg Pages repo - brand: favicon/avatar/og/app-icons/kit regenerated for pl; drop pl from the prospective lists in brand.astro / gen-brandkit / gen-banners (now live)