TekH 522de8a863 feat: Add IPdfProcessor.MergePdfsAsync interface ...

- Add MergePdfsAsync method to IPdfProcessor interface
- Parameters: IReadOnlyList<Stream> pdfStreams, IReadOnlyList<string?>? pageRanges
- Returns: Task<byte[]> (merged PDF)
- Validates: Minimum 2 PDFs, stream Position = 0, page ranges count matches PDF count
- Supports optional page ranges (e.g., '1-3,5' or null for all pages)

2026-07-21 10:20:18 +02:00

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