Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/actions/badges.ts

@@ -0,0 +1,25 @@
+"use server";
+
+import { revalidatePath } from "next/cache";
+import { requireStaff } from "@/lib/admin/guard";
+import { prisma } from "@/lib/prisma";
+
+export async function getBadgeData({ code }: { code: string }) {
+  await requireStaff();
+  const badge = await prisma.websiteBadges.findUnique({
+    where: { badgeKey: code },
+    select: { badgeName: true, badgeDescription: true },
+  });
+  if (!badge) return { ok: false as const, data: null };
+  return { ok: true as const, data: { name: badge.badgeName, desc: badge.badgeDescription } };
+}
+
+export async function updateBadge({ code, name, desc }: { code: string; name: string; desc: string }) {
+  await requireStaff();
+  await prisma.websiteBadges.upsert({
+    where: { badgeKey: code },
+    update: { badgeName: name, badgeDescription: desc, updatedAt: new Date() },
+    create: { badgeKey: code, badgeName: name, badgeDescription: desc, createdAt: new Date(), updatedAt: new Date() },
+  });
+  revalidatePath("/admin/import/badges");
+}