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/settings/page.tsx

@@ -0,0 +1,95 @@
+'use client';
+
+import { useState } from 'react';
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
+import { Button } from '@/components/ui/button';
+import { Badge } from '@/components/ui/badge';
+import {
+  Settings, Trash2, Loader2, FileSpreadsheet, FileText, Presentation,
+} from 'lucide-react';
+import { useI18n } from '@/lib/i18n';
+
+export default function GeneralSettingsPage() {
+  const { t } = useI18n();
+  const [isClearing, setIsClearing] = useState(false);
+
+  const handleClearCache = async () => {
+    setIsClearing(true);
+    try {
+      localStorage.removeItem('translation-settings');
+      sessionStorage.clear();
+      if ('caches' in window) {
+        const cacheNames = await caches.keys();
+        await Promise.all(cacheNames.map(name => caches.delete(name)));
+      }
+      await new Promise(resolve => setTimeout(resolve, 500));
+      window.location.reload();
+    } catch (error) {
+      console.error('Error clearing cache:', error);
+      setIsClearing(false);
+    }
+  };
+
+  const formats = [
+    { icon: <FileSpreadsheet className="w-6 h-6 text-green-500" />, name: 'Excel', ext: '.xlsx, .xls', features: [t('settings.formats.formulas'), t('settings.formats.styles'), t('settings.formats.images')] },
+    { icon: <FileText className="w-6 h-6 text-blue-500" />, name: 'Word', ext: '.docx, .doc', features: [t('settings.formats.headers'), t('settings.formats.tables'), t('settings.formats.images')] },
+    { icon: <Presentation className="w-6 h-6 text-orange-500" />, name: 'PowerPoint', ext: '.pptx, .ppt', features: [t('settings.formats.slides'), t('settings.formats.notes'), t('settings.formats.images')] },
+  ];
+
+  return (
+    <div className="flex flex-col gap-6 p-6 lg:p-8 max-w-3xl">
+      <div>
+        <h1 className="text-2xl font-bold text-foreground">{t('settings.title')}</h1>
+        <p className="text-sm text-muted-foreground mt-1">{t('settings.subtitle')}</p>
+      </div>
+
+      {/* Supported Formats */}
+      <Card>
+        <CardHeader>
+          <div className="flex items-center gap-3">
+            <div className="p-2 rounded-lg bg-primary/10">
+              <Settings className="h-5 w-5 text-primary" />
+            </div>
+            <div>
+              <CardTitle>{t('settings.formats.title')}</CardTitle>
+              <CardDescription>{t('settings.formats.subtitle')}</CardDescription>
+            </div>
+          </div>
+        </CardHeader>
+        <CardContent>
+          <div className="grid grid-cols-1 sm:grid-cols-3 gap-4">
+            {formats.map((f) => (
+              <div key={f.name} className="flex items-start gap-3 p-3 rounded-lg border border-border">
+                <div className="p-2 rounded-lg bg-muted">{f.icon}</div>
+                <div className="flex-1 min-w-0">
+                  <p className="font-semibold text-foreground text-sm">{f.name}</p>
+                  <p className="text-xs text-muted-foreground">{f.ext}</p>
+                  <div className="flex flex-wrap gap-1 mt-1.5">
+                    {f.features.map(ft => (
+                      <Badge key={ft} variant="outline" className="text-[10px] px-1.5 py-0">{ft}</Badge>
+                    ))}
+                  </div>
+                </div>
+              </div>
+            ))}
+          </div>
+        </CardContent>
+      </Card>
+
+      {/* Danger zone */}
+      <Card className="border-border/60">
+        <CardHeader>
+          <CardTitle className="text-base flex items-center gap-2">
+            <Trash2 className="w-4 h-4 text-muted-foreground" /> {t('settings.cache.title')}
+          </CardTitle>
+        </CardHeader>
+        <CardContent className="flex items-center justify-between gap-4">
+          <p className="text-sm text-muted-foreground">{t('settings.cache.desc')}</p>
+          <Button onClick={handleClearCache} disabled={isClearing} variant="outline" size="sm" className="shrink-0">
+            {isClearing ? <><Loader2 className="me-1.5 h-3.5 w-3.5 animate-spin" />{t('settings.cache.clearing')}</> : <><Trash2 className="me-1.5 h-3.5 w-3.5" />{t('settings.cache.clear')}</>}
+          </Button>
+        </CardContent>
+      </Card>
+    </div>
+  );
+}