fix: 波士顿产品矩阵菜单图标(PieChart) — 导入+iconMap注册

frontend/src/layouts/MainLayout.vue

@@ -54,7 +54,7 @@ import api from '../api/index'
 import {
   User, Monitor, Document, TrendCharts, WarningFilled, Connection,
   Menu, Bell, Setting, Coin, DataAnalysis, Money, DataLine,
-  DataBoard, Tools, Collection, Edit, Reading, Opportunity,
+  DataBoard, Tools, Collection, Edit, Reading, Opportunity, PieChart,
 } from '@element-plus/icons-vue'
 import { MENU_ITEMS, ROLE_LABELS } from '../permission'
 
@@ -100,7 +100,7 @@ onMounted(async () => {
 const iconMap: Record<string, any> = {
   Monitor, Document, TrendCharts, WarningFilled, Connection,
   User, Bell, Setting, Coin, DataAnalysis, Money, DataLine,
-  DataBoard, Collection, Edit, Reading, Opportunity,
+  DataBoard, Collection, Edit, Reading, Opportunity, PieChart,
 }
 
 // 分组图标映射 — PDCA五组