Add support for cap, a pow captcha, and implement on contact form

src/pages/cap/redeem.ts

@@ -0,0 +1,14 @@
+import type { APIRoute } from "astro";
+import cap from "@lib/cap";
+export const prerender = false;
+
+export const POST: APIRoute = async ({ request }) => {
+  const { token, solutions } = await request.json();
+  if (!token || !solutions) {
+    return new Response(JSON.stringify({ success: false }), { status: 400 });
+  }
+  return new Response(
+    JSON.stringify(await cap.redeemChallenge({ token, solutions })),
+    { status: 200 },
+  );
+};