chore: remove WHM trademark references, rename package, bump v0.4.6

WHM is a registered trademark of cPanel, L.L.C. Replace all occurrences:
- Sidebar: 'Basic WebHost Manager® Setup' → 'Basic NixServer Setup'
- Sidebar: 'WHM Marketplace' → 'NixServer Marketplace'
- Sidebar: 'OpenAPI Documentation for WHM' → 'OpenAPI Documentation for NixServer'
- nixserver/package.json: @nixpanel/whm → @nixpanel/nixserver
- server/src/app.ts: whmDist variable → nixserverDist

nixserver/package.json

@@ -1,6 +1,6 @@
 {
-  "name": "@nixpanel/whm",
-  "version": "0.4.3",
+  "name": "@nixpanel/nixserver",
+  "version": "0.4.6",
   "private": true,
   "type": "module",
   "scripts": {

nixserver/src/components/Layout.tsx

@@ -28,7 +28,7 @@ const NAV: NavCategory[] = [
     label: 'Server Configuration',
     icon: Settings,
     items: [
-      { label: 'Basic WebHost Manager® Setup',    to: '/settings' },
+      { label: 'Basic NixServer Setup',             to: '/settings' },
       { label: 'Change Root Password',             to: '/security' },
       { label: 'Configure Analytics',              to: '/settings' },
       { label: 'Configure Cron Jobs',              to: '/settings' },
@@ -40,7 +40,7 @@ const NAV: NavCategory[] = [
       { label: 'Terminal',                         to: '/system'   },
       { label: 'Tweak Settings',                   to: '/settings' },
       { label: 'Update Preferences',               to: '/settings' },
-      { label: 'WHM Marketplace',                  to: '/settings' },
+      { label: 'NixServer Marketplace',             to: '/settings' },
     ],
   },
   {
@@ -424,7 +424,7 @@ const NAV: NavCategory[] = [
       { label: 'Manage API Tokens',                  to: '/settings' },
       { label: 'Manage Hooks',                       to: '/settings' },
       { label: 'OpenAPI Documentation for NixPanel', to: '/settings' },
-      { label: 'OpenAPI Documentation for WHM',      to: '/settings' },
+      { label: 'OpenAPI Documentation for NixServer', to: '/settings' },
     ],
   },
   {