fix(parser): 用 pypdfium2(BSD) 替换 pymupdf(AGPL) 渲染 PDF，消除 AGPL 传染风险 - #897
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- pdf_utils 预检：pypdfium2 打开加密 PDF 抛 PdfiumError（消息含 password）， 据此映射 encrypted_pdf 错误码 - rapid_ocr/deepseek_ocr：渲染缩放换算（72dpi 基准），输出 PIL 图像/PNG - is_text_pdf：用 get_textpage().get_text_bounded() 提取文本 - 测试 _build_pdf 改用 pypdf 构造最小文本 PDF（pypdfium2 只读不能写） - pyproject：pymupdf>=1.25.5 -> pypdfium2>=5.0.0，同步 uv.lock Fixes xerrors#865
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变更描述
将 PDF 渲染/解析从
pymupdf(AGPL-3.0) 替换为pypdfium2(BSD-3-Clause + Apache-2.0)，消除 AGPL 网络服务传染风险。涉及 4 处源码 + 1 处测试 + 依赖：
pdf_utils.py预检：pypdfium2 打开加密 PDF 抛PdfiumError（消息含 password），据此映射 encrypted_pdf 错误码rapid_ocr.py：page.render(scale=zoom).to_pil()替换 pixmap 渲染deepseek_ocr.py：dpi→scale 换算（200dpi = 200/72），PIL 输出 PNGutils/__init__.py：get_textpage().get_text_bounded()提取文本test_parser_facade.py：pypdfium2 只读不能造 PDF，_build_pdf改用 pypdf（已在 lock 中）构造最小文本 PDFpymupdf>=1.25.5→pypdfium2>=5.0.0，同步 uv.lock变更类型
测试
test_parser_facade.py→ 19 passed, 1 skippedpytest -m unit test/unit→ 177 passed（仅 1 个既有无关失败）说明
关联 issue：#865。
Fixes #865