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/router/__tests__/router.guard.test.js

@@ -11,7 +11,12 @@ vi.mock('../../views/auth/LoginView.vue', () => ({ default: { template: '<div />
 vi.mock('../../views/auth/RegisterView.vue', () => ({ default: { template: '<div />' } }))
 vi.mock('../../views/auth/PasswordResetView.vue', () => ({ default: { template: '<div />' } }))
 vi.mock('../../views/auth/NewPasswordView.vue', () => ({ default: { template: '<div />' } }))
-vi.mock('../../views/AdminView.vue', () => ({ default: { template: '<div />' } }))
+vi.mock('../../layouts/AdminLayout.vue', () => ({ default: { template: '<div><router-view /></div>' } }))
+vi.mock('../../views/admin/AdminOverviewView.vue', () => ({ default: { template: '<div />' } }))
+vi.mock('../../views/admin/AdminUsersView.vue', () => ({ default: { template: '<div />' } }))
+vi.mock('../../views/admin/AdminQuotasView.vue', () => ({ default: { template: '<div />' } }))
+vi.mock('../../views/admin/AdminAiView.vue', () => ({ default: { template: '<div />' } }))
+vi.mock('../../views/admin/AdminAuditView.vue', () => ({ default: { template: '<div />' } }))
 vi.mock('../../views/SharedView.vue', () => ({ default: { template: '<div />' } }))
 
 // Heavy view components imported statically — stub them too
@@ -78,4 +83,18 @@ describe('router — admin guard (SEC-07)', () => {
     await router.push('/admin')
     expect(router.currentRoute.value.path).toBe('/admin')
   })
+
+  it('redirects an admin user away from / to /admin (D-09)', async () => {
+    // Arrange: admin trying to navigate to a regular user route
+    useAuthStore.mockReturnValue({
+      accessToken: 'fake-token',
+      user: { id: '1', role: 'admin' },
+      refresh: vi.fn().mockResolvedValue(undefined),
+    })
+
+    // Act: admin attempts to visit the regular user home
+    await router.push('/')
+    // The D-09 guard branch returns { path: '/admin' }
+    expect(router.currentRoute.value.path).toBe('/admin')
+  })
 })