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/stores/useAuthStore.ts

@@ -0,0 +1,73 @@
+import { defineStore } from 'pinia'
+import { computed, ref } from 'vue'
+import { apiClient } from '@/lib/axios'
+
+interface PortalUser {
+  id: string
+  name: string
+  email: string
+}
+
+const TOKEN_KEY = 'crewli_portal_token'
+
+export const useAuthStore = defineStore('auth', () => {
+  const token = ref<string | null>(localStorage.getItem(TOKEN_KEY))
+  const user = ref<PortalUser | null>(null)
+  const isInitialized = ref(false)
+
+  const isAuthenticated = computed(() => !!token.value && !!user.value)
+
+  function setToken(newToken: string) {
+    token.value = newToken
+    localStorage.setItem(TOKEN_KEY, newToken)
+  }
+
+  function setUser(data: PortalUser) {
+    user.value = data
+  }
+
+  function logout() {
+    token.value = null
+    user.value = null
+    localStorage.removeItem(TOKEN_KEY)
+  }
+
+  let initializePromise: Promise<void> | null = null
+
+  function initialize(): Promise<void> {
+    if (isInitialized.value) return Promise.resolve()
+    if (!initializePromise) {
+      initializePromise = doInitialize()
+    }
+    return initializePromise
+  }
+
+  async function doInitialize(): Promise<void> {
+    if (!token.value) {
+      isInitialized.value = true
+      return
+    }
+
+    try {
+      const { data } = await apiClient.get<{ success: boolean; data: PortalUser }>('/auth/me')
+      setUser(data.data)
+    }
+    catch {
+      logout()
+    }
+    finally {
+      isInitialized.value = true
+    }
+  }
+
+  return {
+    token,
+    user,
+    isAuthenticated,
+    isInitialized,
+    setToken,
+    setUser,
+    logout,
+    initialize,
+  }
+})