feat(09-04): delete AdminView + 4 tab files; update tests + router guard test

- git rm AdminView.vue, AdminUsersTab.vue, AdminQuotasTab.vue, AdminAiConfigTab.vue, AuditLogTab.vue
- Migrate tab tests to import from views/admin/Admin*View.vue
- Update router.guard.test.js: replace AdminView mock with AdminLayout + 5 admin view mocks
- Add D-09 redirect test (admin on / → /admin)
- Fix stale api/admin.js JSDoc consumer list
- Fix SettingsView.vue stale AdminView comment reference

frontend/src/views/AdminView.vue

@@ -1,43 +0,0 @@
-<template>
-  <div class="p-8 max-w-5xl mx-auto">
-    <h2 class="text-2xl font-semibold text-gray-900 mb-6">Admin panel</h2>
-
-    <!-- Tab strip -->
-    <div class="flex border-b border-gray-200 mb-6">
-      <button
-        v-for="tab in tabs"
-        :key="tab.id"
-        @click="activeTab = tab.id"
-        class="px-4 py-2 text-sm font-semibold border-b-2 transition-colors"
-        :class="activeTab === tab.id
-          ? 'text-indigo-600 border-indigo-600'
-          : 'text-gray-500 hover:text-gray-700 border-transparent'"
-      >
-        {{ tab.label }}
-      </button>
-    </div>
-
-    <!-- Tab content -->
-    <AdminUsersTab v-if="activeTab === 'users'" />
-    <AdminQuotasTab v-if="activeTab === 'quotas'" />
-    <AdminAiConfigTab v-if="activeTab === 'ai'" />
-    <AuditLogTab v-if="activeTab === 'audit'" />
-  </div>
-</template>
-
-<script setup>
-import { ref } from 'vue'
-import AdminUsersTab from '../components/admin/AdminUsersTab.vue'
-import AdminQuotasTab from '../components/admin/AdminQuotasTab.vue'
-import AdminAiConfigTab from '../components/admin/AdminAiConfigTab.vue'
-import AuditLogTab from '../components/admin/AuditLogTab.vue'
-
-const tabs = [
-  { id: 'users', label: 'Users' },
-  { id: 'quotas', label: 'Quotas' },
-  { id: 'ai', label: 'AI Config' },
-  { id: 'audit', label: 'Audit Log' },
-]
-
-const activeTab = ref('users')
-</script>

frontend/src/views/SettingsView.vue

@@ -27,7 +27,7 @@
       </button>
     </div>
 
-    <!-- Tab strip (copy AdminView pattern verbatim) -->
+    <!-- Tab strip -->
     <div class="flex border-b border-gray-200 mb-6">
       <button
         v-for="tab in tabs"