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/actions/admin-emulator.ts

@@ -0,0 +1,36 @@
+"use server";
+
+import { revalidatePath } from "next/cache";
+import { requireStaff } from "@/lib/admin/guard";
+import { prisma } from "@/lib/prisma";
+
+// emulator_settings: PK is the string column `key`, payload is `value` (VarChar 512).
+// emulator_texts: PK is the string column `key`, payload is `value` (VarChar 4096).
+// Both tables are emulator-owned; we only ever read/update existing rows or add new
+// keys via upsert. We never migrate or drop them.
+
+export async function updateEmulatorSetting(formData: FormData): Promise<void> {
+  await requireStaff();
+  const key = String(formData.get("key") ?? "").trim().slice(0, 100);
+  const value = String(formData.get("value") ?? "").slice(0, 512);
+  if (!key) return;
+  await prisma.emulatorSettings.upsert({
+    where: { key },
+    update: { value },
+    create: { key, value },
+  });
+  revalidatePath("/admin/emulator");
+}
+
+export async function updateEmulatorText(formData: FormData): Promise<void> {
+  await requireStaff();
+  const key = String(formData.get("key") ?? "").trim().slice(0, 100);
+  const value = String(formData.get("value") ?? "").slice(0, 4096);
+  if (!key) return;
+  await prisma.emulatorTexts.upsert({
+    where: { key },
+    update: { value },
+    create: { key, value },
+  });
+  revalidatePath("/admin/emulator");
+}