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/DashboardSidebar.tsx

@@ -2,7 +2,7 @@
 
 import Link from 'next/link';
 import { usePathname } from 'next/navigation';
-import { Languages, ChevronLeft, LogOut } from 'lucide-react';
+import { Languages, LogOut } from 'lucide-react';
 import { cn } from '@/lib/utils';
 import { Avatar, AvatarFallback } from '@/components/ui/avatar';
 import { Badge } from '@/components/ui/badge';
@@ -83,17 +83,14 @@ export function DashboardSidebar() {
                   {translateTier(t, user.tier)}
                 </Badge>
               </div>
+              <ThemeToggle />
             </div>
             <Separator />
           </>
         )}
 
         {/* Actions */}
-        <div className="px-3 py-3 space-y-1">
-          <div className="flex items-center justify-between px-3 py-1.5">
-            <span className="text-xs text-muted-foreground">{t('dashboard.sidebar.theme')}</span>
-            <ThemeToggle />
-          </div>
+        <div className="px-3 py-3">
           <Button
             variant="ghost"
             size="sm"
@@ -103,12 +100,6 @@ export function DashboardSidebar() {
             <LogOut className="size-3.5" />
             {t('dashboard.sidebar.signOut')}
           </Button>
-          <Button variant="ghost" size="sm" className="w-full justify-start gap-2 text-muted-foreground" asChild>
-            <Link href="/">
-              <ChevronLeft className="size-3.5" />
-              {t('dashboard.sidebar.backHome')}
-            </Link>
-          </Button>
         </div>
       </div>
     </aside>