feat(web): install global fetch wrapper with credentials + 401 handling

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

web/src/main.ts

@@ -2,9 +2,12 @@ import { createApp } from 'vue';
 import { createPinia } from 'pinia';
 import App from './App.vue';
 import router from './router/index.js';
+import { installApiClient } from './api/http.js';
 import './styles/global.scss';
 import './styles/mobile.scss';
 
+installApiClient();
+
 const app = createApp(App);
 app.use(createPinia());
 app.use(router);