Add niche admin + public expansions + self-host Nunito font (batches 3-4)

Built via two more parallel agent workflows (read schema -> return files),
integrated + verified.

Admin: /admin/emulator (emulator_settings + emulator_texts key/value editor),
/admin/badges (give-badge via RCON), /admin/rare-values (CRUD), /admin/housekeeping
(CRUD), /admin/email-templates (CRUD), /admin/photos (moderation).
Public: /rares (+[category]), /leaderboard (credits/diamonds/duckets),
/guilds (+[id] members), /redeem (voucher -> sendCurrency).
Expanded: /u/[username] now shows badges + photos + guestbook (post form);
/news/[slug] now shows reactions + comments (comment form). Reactions tallied
in JS (Prisma groupBy typing avoided).
Self-hosted Nunito via next/font/google wired to --font-nunito (the atom theme
font, no runtime external fetch). Header + admin nav extended.

Verified: tsc exit 0, vitest 48/48, next build exit 0.

src/app/admin/layout.tsx

@@ -18,15 +18,21 @@ export default async function AdminLayout({ children }: { children: ReactNode })
           <Link href="/admin/users">Users</Link>
           <Link href="/admin/articles">Articles</Link>
           <Link href="/admin/catalog">Catalog</Link>
+          <Link href="/admin/badges">Badges</Link>
           <Link href="/admin/radio">Radio</Link>
           <Link href="/admin/achievements">Achievements</Link>
+          <Link href="/admin/rare-values">Rare Values</Link>
+          <Link href="/admin/photos">Photos</Link>
           <Link href="/admin/bans">Bans</Link>
           <Link href="/admin/applications">Applications</Link>
           <Link href="/admin/wordfilter">Word Filter</Link>
           <Link href="/admin/ip">IP Management</Link>
           <Link href="/admin/logs">Logs</Link>
           <Link href="/admin/teams">Teams</Link>
+          <Link href="/admin/housekeeping">Housekeeping</Link>
           <Link href="/admin/permissions">Permissions</Link>
+          <Link href="/admin/emulator">Emulator</Link>
+          <Link href="/admin/email-templates">Email</Link>
           <Link href="/admin/settings">Settings</Link>
         </nav>
       </aside>