feat: 本次提交更新内容如下

定版本，准备大批量迁移

nkebao/src/pages/plans/PlanDetail.tsx

@@ -0,0 +1,8 @@
+import React from "react";
+import PlaceholderPage from "@/components/PlaceholderPage";
+
+const PlanDetail: React.FC = () => {
+  return <PlaceholderPage title="计划详情" />;
+};
+
+export default PlanDetail;

nkebao/src/pages/plans/Plans.tsx

@@ -0,0 +1,10 @@
+import React from "react";
+import PlaceholderPage from "@/components/PlaceholderPage";
+
+const Plans: React.FC = () => {
+  return (
+    <PlaceholderPage title="计划管理" showAddButton addButtonText="新建计划" />
+  );
+};
+
+export default Plans;