feat: initial schemas-app implementation

- Add Nuxt 4 application with Vuetify UI framework
- Implement GraphQL schema registry management interface
- Add Apollo Client integration with Auth0 authentication
- Create organization and API key management
- Add schema and ref browsing capabilities
- Implement organization switcher for multi-org users
- Add delete functionality for organizations and API keys
- Create Kubernetes deployment descriptors
- Add Docker configuration with nginx

Features:
- Dashboard with organization overview
- Schema browsing by ref with supergraph viewing
- Ref management with schema details
- Settings page for organizations and API keys
- User list per organization with provider icons
- Admin-only organization creation
- Delete confirmations with warnings

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/composables/useOrganizationSelector.ts

@@ -0,0 +1,60 @@
+import { useAuth0 } from '@auth0/auth0-vue'
+import { computed, ref, watch } from 'vue'
+
+import { useOrganizationsQuery } from '~/graphql/generated'
+
+const selectedOrgId = ref<string | null>(null)
+
+export const useOrganizationSelector = () => {
+  const auth0 = useAuth0()
+
+  // Fetch user's organizations
+  const { result, loading, error, refetch } = useOrganizationsQuery(() => ({
+    skip: !auth0.isAuthenticated.value,
+  }))
+
+  // Get list of organizations
+  const organizations = computed(() => {
+    return result.value?.organizations || []
+  })
+
+  // Get currently selected organization
+  const selectedOrganization = computed(() => {
+    if (!selectedOrgId.value) return null
+    return organizations.value.find(org => org.id === selectedOrgId.value) || null
+  })
+
+  // Auto-select first organization if none selected
+  watch(organizations, (orgs) => {
+    if (orgs.length > 0 && !selectedOrgId.value) {
+      // Try to restore from localStorage
+      const saved = localStorage.getItem('selectedOrgId')
+      if (saved && orgs.find(o => o.id === saved)) {
+        selectedOrgId.value = saved
+      } else {
+        selectedOrgId.value = orgs[0].id
+      }
+    }
+  }, { immediate: true })
+
+  // Save selection to localStorage
+  watch(selectedOrgId, (newId) => {
+    if (newId) {
+      localStorage.setItem('selectedOrgId', newId)
+    }
+  })
+
+  const selectOrganization = (orgId: string) => {
+    selectedOrgId.value = orgId
+  }
+
+  return {
+    organizations,
+    selectedOrganization,
+    selectedOrgId: computed(() => selectedOrgId.value),
+    selectOrganization,
+    loading: loading || ref(false),
+    error: error || ref(null),
+    refetch,
+  }
+}