feat: merge admin routes into unified frontend

frontend-web/src/app/admin/(secure)/invite-relations/page.tsx

@@ -0,0 +1,40 @@
+"use client";
+
+import { useQuery } from "@tanstack/react-query";
+
+import { StatusBadge } from "@/components/status-badge";
+import { api } from "@/lib/api";
+
+type InviteRelation = {
+  id: number;
+  inviterUserId: number;
+  inviteeUserId: number;
+  rewardStatus: string;
+  rewardPoints: number;
+};
+
+export default function InviteRelationsPage() {
+  const query = useQuery({
+    queryKey: ["admin-invite-relations"],
+    queryFn: () => api.get<InviteRelation[]>("/api/v1/admin/invite-relations"),
+  });
+
+  return (
+    <section className="panel">
+      <h3>邀请关系</h3>
+      <div className="list-grid">
+        {query.data?.map((item) => (
+          <div className="list-item" key={item.id}>
+            <div className="toolbar">
+              <strong>
+                邀请人 {item.inviterUserId} to 被邀请人 {item.inviteeUserId}
+              </strong>
+              <StatusBadge value={item.rewardStatus} />
+            </div>
+            <div className="muted">奖励积分：{item.rewardPoints}</div>
+          </div>
+        ))}
+      </div>
+    </section>
+  );
+}