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/globals.css

@@ -19,7 +19,7 @@
   --navbar-height: 64px;
   --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.06), 0 4px 14px rgba(15, 23, 42, 0.05);
   --shadow-card-hover: 0 6px 22px rgba(15, 23, 42, 0.12);
-  --font-family: "Nunito", ui-rounded, "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
+  --font-family: var(--font-nunito), ui-rounded, "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
 }
 
 * {