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/lib/format.test.ts

@@ -1,5 +1,17 @@
 import { describe, expect, it } from "vitest";
-import { avatarImageUrl, excerpt } from "./format";
+import { avatarImageUrl, excerpt, slugify } from "./format";
+
+describe("slugify", () => {
+  it("lowercases and hyphenates", () => {
+    expect(slugify("Hello World!")).toBe("hello-world");
+  });
+  it("strips accents via NFKD", () => {
+    expect(slugify("Café del Mar")).toBe("cafe-del-mar");
+  });
+  it("falls back to 'article' for empty input", () => {
+    expect(slugify("  ***  ")).toBe("article");
+  });
+});
 
 describe("avatarImageUrl", () => {
   const base = "https://www.habbo.com/habbo-imaging/avatarimage";