Update nginx-ui.sh

The previous install script started nginx-ui for 3 seconds, stopped it,
and ran reset-password to create an admin user. This caused:
- Race condition: the internal setup wizard could trigger during the brief
  start window, conflicting with the reset-password approach
- Admin users unable to login after the setup wizard fired
- Settings lockup due to overloaded app.ini with hardcoded nginx paths
  that conflict with UI-managed settings

Changes:
- Remove start/stop/reset-password hack from install script
- Simplify app.ini to match upstream defaults (minimal config)
- Let users complete the natural setup wizard on first visit
- Update JSON: remove default credentials, add setup wizard note
- Add setup wizard hint to CT script output

The setup wizard properly handles admin account creation and ACME email
configuration, which are both needed for full functionality.

Ref: ProxmoxVED#1408

frontend/public/json/nginx-ui.json

@@ -28,10 +28,14 @@
         }
     ],
     "default_credentials": {
-        "username": "admin",
+        "username": null,
         "password": null
     },
     "notes": [
+        {
+            "text": "On first visit, the setup wizard will guide you to create an admin account and configure ACME email.",
+            "type": "warning"
+        },
         {
             "text": "Nginx runs on ports 80/443, Nginx UI management interface on port 9000.",
             "type": "info"
@@ -39,10 +43,6 @@
         {
             "text": "SSL certificates can be managed automatically with Let's Encrypt integration.",
             "type": "info"
-        },
-        {
-            "text": "Initial Login data: `cat ~/nginx-ui.creds`",
-            "type": "info"
         }
     ]
 }

install/nginx-ui-install.sh

@@ -30,29 +30,20 @@ msg_ok "Installed Nginx UI"
 msg_info "Configuring Nginx UI"
 mkdir -p /usr/local/etc/nginx-ui
 cat <<EOF >/usr/local/etc/nginx-ui/app.ini
-[server]
-HttpHost = 0.0.0.0
-HttpPort = 9000
-RunMode = release
-JwtSecret = $(openssl rand -hex 32)
-
-[nginx]
-AccessLogPath = /var/log/nginx/access.log
-ErrorLogPath = /var/log/nginx/error.log
-ConfigDir = /etc/nginx
-PIDPath = /run/nginx.pid
-TestConfigCmd = nginx -t
-ReloadCmd = nginx -s reload
-RestartCmd = systemctl restart nginx
-
 [app]
 PageSize = 10
 
+[server]
+Host = 0.0.0.0
+Port = 9000
+RunMode = release
+JwtSecret = $(openssl rand -hex 32)
+
 [cert]
-Email =
-CADir =
-RenewalInterval = 7
-RecursiveNameservers =
+HTTPChallengePort = 9180
+
+[terminal]
+StartCmd = login
 EOF
 msg_ok "Configured Nginx UI"
 
@@ -78,17 +69,6 @@ EOF
 systemctl daemon-reload
 msg_ok "Created Service"
 
-msg_info "Creating Initial Admin User"
-systemctl start nginx-ui
-sleep 3
-systemctl stop nginx-ui
-sleep 1
-/usr/local/bin/nginx-ui reset-password --config /usr/local/etc/nginx-ui/app.ini &>/tmp/nginx-ui-reset.log || true
-ADMIN_PASS=$(grep -oP 'Password: \K\S+' /tmp/nginx-ui-reset.log || echo "admin")
-echo -e "Nginx-UI Credentials\nUsername: admin\nPassword: $ADMIN_PASS" >~/nginx-ui.creds
-rm -f /tmp/nginx-ui-reset.log
-msg_ok "Created Initial Admin User"
-
 msg_info "Starting Service"
 systemctl enable -q --now nginx-ui
 rm -rf /etc/nginx/sites-enabled/default