feet：solve

src/app/pages/admin/system-settings/system-settings.ts

@@ -1,3 +1,10 @@
+// 扩展Window接口以包含echarts属性
+declare global {
+  interface Window {
+    echarts: any;
+  }
+}
+
 import { Component, OnInit, AfterViewInit, ViewChild, ElementRef } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { RouterModule } from '@angular/router';