feat: initial test static site with Deno backend

pages/api/echo.ts

@@ -0,0 +1,30 @@
+// POST /api/echo — echoes back the request body with server metadata.
+export async function API_post(req: Request): Promise<Response> {
+  let body: unknown = null;
+
+  try {
+    body = await req.json();
+  } catch {
+    return Response.json(
+      { error: "Invalid JSON body" },
+      { status: 400 },
+    );
+  }
+
+  return Response.json({
+    echo: body,
+    server: {
+      time: new Date().toISOString(),
+      method: req.method,
+      headers: Object.fromEntries(req.headers.entries()),
+    },
+  });
+}
+
+// GET /api/echo — returns usage instructions.
+export async function API_get(req: Request): Promise<Response> {
+  return Response.json({
+    usage: "POST a JSON body to this endpoint to see it echoed back.",
+    example: { text: "hello", timestamp: "2026-04-11T00:00:00Z" },
+  });
+}