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/useFileUpload.ts

@@ -1,11 +1,11 @@
 import { useState, useCallback } from 'react';
 import type { UseFileUploadReturn } from './types';
 
-const ACCEPTED_EXTENSIONS = ['xlsx', 'docx', 'pptx'];
+const ACCEPTED_EXTENSIONS = ['xlsx', 'docx', 'pptx', 'pdf'];
 const MAX_FILE_SIZE = 50 * 1024 * 1024;
 
 export const ERROR_MESSAGES = {
-  INVALID_FORMAT: 'Format non supporté. Formats acceptés : .xlsx, .docx, .pptx',
+  INVALID_FORMAT: 'Format non supporté. Formats acceptés : .xlsx, .docx, .pptx, .pdf',
   FILE_TOO_LARGE: 'Fichier trop volumineux (max 50 MB)',
 } as const;