fix: Register staff notifications route and fix import paths

## 🐛 Bug Fixes

**App.tsx:**
- ✅ Added StaffNotifications import
- ✅ Registered `/settings/notifications/staff` route

**Staff/Channels.tsx:**
- ✅ Fixed SettingsCard import path (../../components/SettingsCard)
- ✅ Fixed ChannelConfig import path (../ChannelConfig)

**Staff.tsx:**
- ✅ Removed recipientType prop from Templates (not supported yet)

---

**Status:** Staff notifications route should now work correctly

admin-spa/src/routes/Settings/Notifications/Staff.tsx

@@ -41,7 +41,7 @@ export default function StaffNotifications() {
         </TabsContent>
 
         <TabsContent value="templates" className="space-y-4">
-          <NotificationTemplates recipientType="staff" />
+          <NotificationTemplates />
         </TabsContent>
       </Tabs>
     </SettingsLayout>

admin-spa/src/routes/Settings/Notifications/Staff/Channels.tsx

@@ -1,14 +1,14 @@
 import React, { useState, useEffect } from 'react';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { api } from '@/lib/api';
-import { SettingsCard } from '../components/SettingsCard';
+import { SettingsCard } from '../../components/SettingsCard';
 import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
 import { Switch } from '@/components/ui/switch';
 import { RefreshCw, Mail, MessageCircle, Send, Bell, ExternalLink, Settings, Check, X } from 'lucide-react';
 import { toast } from 'sonner';
 import { __ } from '@/lib/i18n';
-import ChannelConfig from './ChannelConfig';
+import ChannelConfig from '../ChannelConfig';
 
 interface NotificationChannel {
   id: string;