Add admin Articles (CRUD) + Bans resources

- Articles: list / new / edit / delete (websiteArticles), unique-slug
  generation via slugify() (pure, unit-tested); staff-gated server actions.
- Bans: list active bans (ban_expire > now), create ban (writes the bans row +
  RCON disconnect) with type/duration/reason, lift ban; staff-gated actions.
- Admin nav extended (Articles, Bans).

Verified: tsc exit 0, vitest 48/48, next build exit 0 (7 /admin routes).

src/actions/admin-articles.ts

@@ -0,0 +1,64 @@
+"use server";
+
+import { revalidatePath } from "next/cache";
+import { redirect } from "next/navigation";
+import { slugify } from "@/lib/format";
+import { requireStaff } from "@/lib/admin/guard";
+import { prisma } from "@/lib/prisma";
+
+async function uniqueSlug(title: string): Promise<string> {
+  const base = slugify(title);
+  let slug = base;
+  let n = 2;
+  while (await prisma.websiteArticles.findUnique({ where: { slug } })) {
+    slug = `${base}-${n++}`;
+  }
+  return slug;
+}
+
+export async function createArticle(formData: FormData): Promise<void> {
+  const staff = await requireStaff();
+  const title = String(formData.get("title") ?? "").trim();
+  const shortStory = String(formData.get("shortStory") ?? "").trim();
+  const fullStory = String(formData.get("fullStory") ?? "").trim();
+  const image = String(formData.get("image") ?? "").trim();
+  if (!title) return;
+
+  const now = new Date();
+  await prisma.websiteArticles.create({
+    data: {
+      slug: await uniqueSlug(title),
+      title: title.slice(0, 255),
+      shortStory: shortStory.slice(0, 255),
+      fullStory,
+      image: image.slice(0, 255),
+      userId: String(staff.id),
+      createdAt: now,
+      updatedAt: now,
+    },
+  });
+  redirect("/admin/articles");
+}
+
+export async function updateArticle(formData: FormData): Promise<void> {
+  await requireStaff();
+  const id = BigInt(String(formData.get("id")));
+  await prisma.websiteArticles.update({
+    where: { id },
+    data: {
+      title: String(formData.get("title") ?? "").trim().slice(0, 255),
+      shortStory: String(formData.get("shortStory") ?? "").trim().slice(0, 255),
+      fullStory: String(formData.get("fullStory") ?? "").trim(),
+      image: String(formData.get("image") ?? "").trim().slice(0, 255),
+      updatedAt: new Date(),
+    },
+  });
+  revalidatePath(`/admin/articles/${id}`);
+  redirect("/admin/articles");
+}
+
+export async function deleteArticle(formData: FormData): Promise<void> {
+  await requireStaff();
+  await prisma.websiteArticles.delete({ where: { id: BigInt(String(formData.get("id"))) } });
+  redirect("/admin/articles");
+}