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.

scripts/generate_sitemap.py

@@ -15,6 +15,15 @@ TOOLS = [
     '/tools/pdf-to-word',
     '/tools/word-to-pdf',
     '/tools/compress-pdf',
+    '/tools/merge-pdf',
+    '/tools/split-pdf',
+    '/tools/rotate-pdf',
+    '/tools/pdf-to-images',
+    '/tools/images-to-pdf',
+    '/tools/watermark-pdf',
+    '/tools/protect-pdf',
+    '/tools/unlock-pdf',
+    '/tools/page-numbers',
     '/tools/image-converter',
     '/tools/video-to-gif',
     '/tools/word-counter',