Add public REST API, anti-abuse protections, radio/GitHub cron jobs

Phase A — Public REST API (was the biggest gap). 20 JSON endpoints under
/api mirroring AtomCMS: users/[username], online(+/count), me, articles
(+/[slug]), photos, home, staff, teams, leaderboard, shop(+/categories),
values(+/categories), settings, radio/{config,now-playing,listeners,
shouts}. Shared src/lib/api.ts (apiJson — BigInt-safe + CORS, pagination).
Read-only, fail-soft, and field-safe (never exposes password/auth_ticket/
2FA secrets/mail).

Phase B — Anti-abuse on registration: CAPTCHA (Cloudflare Turnstile /
Google reCAPTCHA, settings-driven, widget rendered on the register page),
VPN/proxy detection (proxycheck.io / IPQualityScore via /admin/vpn
settings), and max-accounts-per-IP. All fail-open when unconfigured.
src/lib/services/{captcha,ip-lookup}.ts.

Phase C — jobs-worker cron suite: radio-record-songs (30s, logs track
changes to radio_song_plays), radio-auto-dj (rotates radio_auto_dj_playlist
when no live DJ), github-update-check (hourly, sets update_available).
Shared src/lib/services/radio.ts (now-playing/listeners parsing).

Verified live (prod, amx_test): /api/* return real JSON (leaderboard 6
users, settings carry no secrets, user endpoint hides password). tsc 0,
vitest 49/49, next build 0 (20 new API routes).

src/app/api/radio/now-playing/route.ts

@@ -0,0 +1,54 @@
+import { apiJson } from "@/lib/api";
+import { siteSettings } from "@/lib/services/site-settings";
+
+// Proxy for the configured radio "now playing" provider. The provider URL is
+// stored in radio_now_playing_api_url; we fetch it server-side (never exposing
+// the URL or any provider key to the browser) with a short, hard timeout.
+export const dynamic = "force-dynamic";
+
+const FETCH_TIMEOUT_MS = 4000;
+
+export async function GET(_req: Request) {
+  let url: string | null = null;
+  try {
+    url = (await siteSettings.get("radio_now_playing_api_url", "")) || null;
+  } catch {
+    url = null;
+  }
+
+  // Not configured — there is nothing to play.
+  if (!url) {
+    return apiJson({ nowPlaying: null });
+  }
+
+  const controller = new AbortController();
+  const timer = setTimeout(() => controller.abort(), FETCH_TIMEOUT_MS);
+  try {
+    const res = await fetch(url, {
+      signal: controller.signal,
+      cache: "no-store",
+      headers: { accept: "application/json, text/plain, */*" },
+    });
+
+    const raw = (await res.text()).trim();
+    if (raw === "") {
+      return apiJson({ nowPlaying: null });
+    }
+
+    // Return parsed JSON when the provider speaks JSON, else the raw text body.
+    try {
+      return apiJson(JSON.parse(raw));
+    } catch {
+      return apiJson({ nowPlaying: raw.slice(0, 2000) });
+    }
+  } catch (e) {
+    const aborted = e instanceof Error && e.name === "AbortError";
+    return apiJson({
+      error: aborted
+        ? `Timed out after ${FETCH_TIMEOUT_MS / 1000}s`
+        : "Fetch failed",
+    });
+  } finally {
+    clearTimeout(timer);
+  }
+}