feat(admin): add image quota management UI on memind_adm 5174

Add image-quota admin pages and API wiring for plan defaults, ledger, and per-user
grants, plus local verify scripts and AGENTS.md note that this repo is the sole
admin UI surface.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/App.tsx

@@ -5,6 +5,7 @@ import { AdminLayout } from './admin/AdminLayout';
 import { BillingPage } from './admin/pages/BillingPage';
 import { CapabilitiesPage } from './admin/pages/CapabilitiesPage';
 import { DashboardPage } from './admin/pages/DashboardPage';
+import { ImageQuotaPage } from './admin/pages/ImageQuotaPage';
 import { PoliciesPage } from './admin/pages/PoliciesPage';
 import { MindSpacePage } from './admin/pages/MindSpacePage';
 import { MemoryV2Page } from './admin/pages/MemoryV2Page';
@@ -119,6 +120,7 @@ function AdminApp({ user, onLogout }: { user: PortalUser; onLogout: () => void }
           <Route path="users" element={<UsersPage />} />
           <Route path="users/:userId" element={<UserDetailPage />} />
           <Route path="billing/*" element={<BillingPage />} />
+          <Route path="image-quota" element={<ImageQuotaPage />} />
           <Route path="capabilities" element={<CapabilitiesPage />} />
           <Route path="skills" element={<SkillsPage />} />
           <Route path="system-tests" element={<SystemTestsPage />} />
@@ -170,6 +172,7 @@ function loginRedirectPath(pathname: string, role: string | undefined) {
   if (
     pathname.startsWith('/users')
     || pathname.startsWith('/billing')
+    || pathname.startsWith('/image-quota')
     || pathname.startsWith('/capabilities')
     || pathname.startsWith('/skills')
     || pathname.startsWith('/system-tests')