feat：初始化业务目录

src/app/admin/(shell)/page.tsx

@@ -0,0 +1,54 @@
+import { ModuleScaffold } from "@/components/admin/module-scaffold";
+import { getAdminPing } from "@/lib/admin-http";
+import { dashboardModuleMeta } from "@/modules/dashboard/meta";
+import type { Metadata } from "next";
+
+export const metadata: Metadata = {
+  title: "总览",
+};
+
+export default async function AdminDashboardPage() {
+  const ping = await getAdminPing();
+  const apiReady = process.env.NEXT_PUBLIC_LOTTERY_API_BASE_URL?.trim() !== "";
+
+  return (
+    <ModuleScaffold
+      title={dashboardModuleMeta.title}
+      description={dashboardModuleMeta.description}
+    >
+      <div className="grid gap-4 sm:grid-cols-2">
+        <div className="rounded-xl border border-black/10 bg-white p-5 shadow-sm dark:border-white/10 dark:bg-zinc-900">
+          <h2 className="text-xs font-semibold uppercase tracking-wide text-zinc-500 dark:text-zinc-400">
+            API 基底
+          </h2>
+          <p className="mt-2 text-sm text-foreground">
+            {apiReady ? (
+              <span className="font-medium text-emerald-600 dark:text-emerald-400">
+                已配置 NEXT_PUBLIC_LOTTERY_API_BASE_URL
+              </span>
+            ) : (
+              <span className="font-medium text-amber-600 dark:text-amber-400">
+                未配置环境变量，无法在服务端探测 Laravel
+              </span>
+            )}
+          </p>
+          <p className="mt-3 text-xs leading-relaxed text-zinc-500 dark:text-zinc-400">
+            与玩家端一致，指向 Laravel 根地址（会自动请求{" "}
+            <code className="rounded bg-zinc-100 px-1 py-0.5 dark:bg-zinc-800">
+              /api/v1/admin/ping
+            </code>
+            ）。
+          </p>
+        </div>
+        <div className="rounded-xl border border-black/10 bg-white p-5 shadow-sm dark:border-white/10 dark:bg-zinc-900">
+          <h2 className="text-xs font-semibold uppercase tracking-wide text-zinc-500 dark:text-zinc-400">
+            Admin Ping
+          </h2>
+          <p className="mt-2 font-mono text-sm text-foreground">
+            {!apiReady ? "—" : ping ? JSON.stringify(ping) : "请求失败或未返回信封"}
+          </p>
+        </div>
+      </div>
+    </ModuleScaffold>
+  );
+}