Add document timestamping to the Secure PDF section using RFC 3161 protocol. Users can select from preset TSA servers (DigiCert, Sectigo, SSL.com, Entrust, FreeTSA) or enter a custom TSA URL. No personal certificate is required — only a cryptographic hash is sent to the server. Key changes: - Timestamp PDF page with TSA server selector, FAQ and SEO structured data - timestampPdf() function with CORS proxy URL resolution - TimestampNode for the workflow engine - Tool entry in Secure PDF category + homepage i18n - Built-in CORS proxy middleware for dev/preview - Translations for all 16 languages Tested with DigiCert, Sectigo and Entrust TSA servers. Timestamps are verifiable in Adobe Acrobat (ETSI.RFC3161 SubFilter).
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