feat(portal): strip Vuexy demo content and create clean portal shell

Remove all demo pages, dialogs, sidebar navigation, and layout components.
Create minimal top-bar portal layout with auth-aware navigation, placeholder
pages for volunteer registration, dashboard, shifts, profile, artist advance,
and login. Add Pinia auth store, axios with Sanctum support, and router guards.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/portal/src/App.vue

@@ -2,25 +2,18 @@
 import { useTheme } from 'vuetify'
 import ScrollToTop from '@core/components/ScrollToTop.vue'
 import initCore from '@core/initCore'
-import { initConfigStore, useConfigStore } from '@core/stores/config'
+import { initConfigStore } from '@core/stores/config'
 import { hexToRgb } from '@core/utils/colorConverter'
 
 const { global } = useTheme()
 
-// ℹ️ Sync current theme with initial loader theme
 initCore()
 initConfigStore()
-
-const configStore = useConfigStore()
 </script>
 
 <template>
-  <VLocaleProvider :rtl="configStore.isAppRTL">
-    <!-- ℹ️ This is required to set the background color of active nav link based on currently active global theme's primary -->
-    <VApp :style="`--v-global-theme-primary: ${hexToRgb(global.current.value.colors.primary)}`">
-      <RouterView />
-
-      <ScrollToTop />
-    </VApp>
-  </VLocaleProvider>
+  <VApp :style="`--v-global-theme-primary: ${hexToRgb(global.current.value.colors.primary)}`">
+    <RouterView />
+    <ScrollToTop />
+  </VApp>
 </template>