remove redundant setting & doc

docs/user-guide/admin-dashboard.md

@@ -195,12 +195,6 @@ Configure core node settings and preferences:
 - **Private Key (nsec)** - Nostr private key with show/hide toggle
 - **Nostr Relays** - Configure relays for provider announcements
 
-#### Security Settings
-
-- **Upstream API Key** - Primary API key for upstream providers
-- **Admin Password** - Change dashboard access password
-- **API Key Visibility** - Control credential display in interface
-
 #### Cashu Mint Management
 
 - **Add Mint URLs** - Configure multiple Cashu mint endpoints

ui/components/settings/admin-settings.tsx

@@ -288,22 +288,6 @@ export function AdminSettings() {
           </CardContent>
         </Card>
 
-        {/* Security Settings */}
-        <Card>
-          <CardHeader>
-            <CardTitle>Security Settings</CardTitle>
-            <CardDescription>
-              Configure authentication and API access
-            </CardDescription>
-          </CardHeader>
-          <CardContent className='space-y-4'>
-            {renderSecretField(
-              'upstream_api_key',
-              'Upstream API Key',
-              'Enter API key'
-            )}
-          </CardContent>
-        </Card>
         {/* Cashu Mints */}
         <Card>
           <CardHeader>