Add centralized API client with axios interceptors, remove vue-axios

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/stores/performance.js

@@ -1,4 +1,5 @@
 import { defineStore } from "pinia";
+import apiClient from "@/api/client.js";
 import apiError from '@/module/apiError.js';
 
 export default defineStore('performanceStore', {
@@ -36,7 +37,7 @@ export default defineStore('performanceStore', {
           break;
       }
       try {
-        const response = await this.$axios.get(api);
+        const response = await apiClient.get(api);
         this.allPerformanceData = response.data;
       } catch(error) {
         apiError(error, 'Failed to load the Performance.');