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Add Sdcb.SimdPaddleOCR.Pdf library that turns page images plus OCR results into searchable, copyable dual-layer PDFs: - PaddleOcrPdfWriter: minimal PDF 1.4 writer (pages, xref, trailer) embedding the original image per page with a transparent text layer positioned from OCR line/character boxes; works with any stream. - PdfTextAlignment: CTC-based character box estimation plus padding emission filtering, so text layer placement follows the image. - PdfImage: SkiaSharp decode into BGRA pixels for the OCR pipeline. - Example SkiaSharp.SearchablePdf: folder of images -> one multi-page PDF or one PDF per image (--separate) with per-stage timing, CPU/memory sampling and JSON/CSV benchmark reports. - Tests: 14 tests covering writer structure, text layer, alignment filtering and round-trip text extraction. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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功能说明
新增 Sdcb.SimdPaddleOCR.Pdf 库与 SkiaSharp.SearchablePdf 示例，把页面图片 + OCR 结果生成为可搜索、可复制的双层 PDF：
PaddleOcrPdfWriter：轻量 PDF 1.4 写入器（页对象、xref、trailer），每页嵌入原始图片 + 依 OCR 行/字符框定位的透明文本层，支持任意 Stream 输出。PdfTextAlignment：基于 CTC 的字符框估计与 padding emission 过滤，文本层与图像对齐。PdfImage：SkiaSharp 解码为 BGRA，供 OCR 流水线使用。SkiaSharp.SearchablePdf：目录图片 -> 单个多页 PDF 或每图一个 PDF（--separate），含分阶段计时、CPU/内存采样与 JSON/CSV 基准报告。使用示例
验证
test/Sdcb.SimdPaddleOCR.Pdf.Tests：14 个测试全部通过（写入器结构、文本层、对齐过滤、round-trip 文本提取）。文档
🤖 由 Copilot 生成