feat: add PDF manipulation tools including Protect, Rotate, Split, Unlock, and Watermark functionalities

- Implemented ProtectPdf component for adding password protection to PDFs.
- Implemented RotatePdf component for rotating PDF pages by specified angles.
- Implemented SplitPdf component for splitting PDFs into individual pages or specified ranges.
- Implemented UnlockPdf component for removing password protection from PDFs.
- Implemented WatermarkPdf component for adding custom text watermarks to PDFs.
- Updated i18n files to include translations for new tools.
- Enhanced HomePage to include links to new PDF tools.
- Updated Nginx configuration to improve security with CSP and Permissions-Policy headers.
- Updated sitemap generation script to include new tools.

backend/app/extensions.py

@@ -29,6 +29,7 @@ def init_celery(app):
         "app.tasks.compress_tasks.*": {"queue": "compress"},
         "app.tasks.image_tasks.*": {"queue": "image"},
         "app.tasks.video_tasks.*": {"queue": "video"},
+        "app.tasks.pdf_tools_tasks.*": {"queue": "pdf_tools"},
     }
 
     class ContextTask(celery.Task):