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/translate/FileDropZone.tsx

@@ -57,24 +57,32 @@ export function FileDropZone({ upload }: FileDropZoneProps) {
 
       {/* Format badges */}
       <div className="flex flex-wrap items-center justify-center gap-3">
-        <span className="flex items-center gap-1.5 rounded-lg border border-border/60 bg-background px-3 py-1.5 text-xs font-medium text-muted-foreground">
-          <FileSpreadsheet className="size-3.5 text-green-500" />
-          Excel (.xlsx)
-        </span>
         <span className="flex items-center gap-1.5 rounded-lg border border-border/60 bg-background px-3 py-1.5 text-xs font-medium text-muted-foreground">
           <FileText className="size-3.5 text-blue-500" />
           Word (.docx)
         </span>
+        <span className="flex items-center gap-1.5 rounded-lg border border-border/60 bg-background px-3 py-1.5 text-xs font-medium text-muted-foreground">
+          <FileSpreadsheet className="size-3.5 text-green-500" />
+          Excel (.xlsx)
+        </span>
         <span className="flex items-center gap-1.5 rounded-lg border border-border/60 bg-background px-3 py-1.5 text-xs font-medium text-muted-foreground">
           <Presentation className="size-3.5 text-orange-500" />
           PowerPoint (.pptx)
         </span>
+        <span className="flex items-center gap-1.5 rounded-lg border border-border/60 bg-background px-3 py-1.5 text-xs font-medium text-muted-foreground">
+          <svg className="size-3.5 text-red-500" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+            <path d="M14.5 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V7.5L14.5 2z"/>
+            <polyline points="14 2 14 8 20 8"/>
+            <text x="12" y="16" textAnchor="middle" fontSize="5" fontWeight="bold" fill="currentColor" stroke="none">PDF</text>
+          </svg>
+          PDF (.pdf)
+        </span>
       </div>
 
       <input
         ref={inputRef}
         type="file"
-        accept=".xlsx,.docx,.pptx"
+        accept=".xlsx,.docx,.pptx,.pdf"
         className="hidden"
         onChange={upload.handleFileSelect}
         aria-label={t('dashboard.translate.dropzone.uploadAria')}