feat: homelab deployment - NPM + IONOS DNS + monitoring + NAS backup

- Restructured docker-compose for Nginx Proxy Manager (no custom nginx)
- Added domain wordly.art configuration
- Added Prometheus + Grafana monitoring stack with pre-configured dashboards
- Added PostgreSQL backup script to NAS (daily/weekly/monthly rotation)
- Added alert rules for backend, system, and Docker metrics
- Updated deployment guide for NPM + IONOS DNS homelab setup
- Added marketing plan document
- PDF translator and watermark support
- Enhanced middleware, routes, and translator modules

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/app/dashboard/constants.ts

@@ -1,4 +1,4 @@
-import { FileText, Key, BookText, User, type LucideIcon } from 'lucide-react';
+import { FileText, Key, BookText, User, Globe, type LucideIcon } from 'lucide-react';
 
 export interface NavItem {
   labelKey: string;
@@ -10,7 +10,8 @@ export interface NavItem {
 export const baseNavItems: NavItem[] = [
   { labelKey: 'dashboard.nav.translate', href: '/dashboard/translate', icon: FileText },
   { labelKey: 'dashboard.nav.profile', href: '/dashboard/profile', icon: User },
-  { labelKey: 'dashboard.nav.apiKeys', href: '/dashboard/api-keys', icon: Key },
+  { labelKey: 'dashboard.nav.context', href: '/dashboard/context', icon: Globe, proOnly: true },
+  { labelKey: 'dashboard.nav.apiKeys', href: '/dashboard/api-keys', icon: Key, proOnly: true },
 ];
 
 export const proNavItem: NavItem = {
@@ -21,5 +22,6 @@ export const proNavItem: NavItem = {
 };
 
 export function getNavItems(isPro: boolean): NavItem[] {
-  return isPro ? [...baseNavItems, proNavItem] : baseNavItems;
+  if (isPro) return [...baseNavItems, proNavItem];
+  return baseNavItems.filter(item => !item.proOnly);
 }