Add per-user API tokens with admin override support

- Add userId field to ApiToken schema (the user identity the token acts as)
- Auth middleware resolves token identity via userId instead of createdById
- New /api/user/api-tokens routes for self-service token management
- Admin /api/admin/api-tokens routes support userId and role overrides
- API Tokens section on profile page for all users
- Admin API tab shows all tokens with user/role selectors

src/app/admin/settings/page.tsx

@@ -23,6 +23,7 @@ import { PathsTab } from './tabs/PathsTab/PathsTab';
 import { EbookTab } from './tabs/EbookTab/EbookTab';
 import { BookDateTab } from './tabs/BookDateTab/BookDateTab';
 import { NotificationsTab } from './tabs/NotificationsTab';
+import { ApiTab } from './tabs/ApiTab/ApiTab';
 
 // Types and Helpers
 import type { Settings, SettingsTab, IndexerConfig, SavedIndexerConfig, Message } from './lib/types';
@@ -346,8 +347,11 @@ export default function AdminSettings() {
           {/* Notifications Tab */}
           {activeTab === 'notifications' && <NotificationsTab />}
 
+          {/* API Tab */}
+          {activeTab === 'api' && <ApiTab />}
+
           {/* Save Button (only for tabs that save through main page) */}
-          {activeTab !== 'ebook' && activeTab !== 'bookdate' && activeTab !== 'notifications' && (
+          {activeTab !== 'ebook' && activeTab !== 'bookdate' && activeTab !== 'notifications' && activeTab !== 'api' && (
             <div className="mt-8 flex gap-4">
               <Button
                 onClick={saveSettings}