feat: 新增 LibreOffice soffice DOCX 解析器

- 新增 scripts/readers/docx/libreoffice.py
- 在 MarkItDown 之后、python-docx 之前插入解析器
- 新增 tests/test_readers/test_docx/test_libreoffice.py
- 更新 openspec/specs/docx-reader/spec.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/readers/docx/__init__.py

@@ -10,6 +10,7 @@ from . import docling
 from . import unstructured
 from . import markitdown
 from . import pypandoc
+from . import libreoffice
 from . import python_docx
 from . import native_xml
 
@@ -19,6 +20,7 @@ PARSERS = [
     ("unstructured", unstructured.parse),
     ("pypandoc-binary", pypandoc.parse),
     ("MarkItDown", markitdown.parse),
+    ("LibreOffice", libreoffice.parse),
     ("python-docx", python_docx.parse),
     ("XML 原生解析", native_xml.parse),
 ]

scripts/readers/docx/libreoffice.py

@@ -0,0 +1,67 @@
+"""使用 LibreOffice soffice 命令行解析 DOCX 文件"""
+
+import subprocess
+import tempfile
+import shutil
+from pathlib import Path
+from typing import Optional, Tuple
+
+
+def parse(file_path: str) -> Tuple[Optional[str], Optional[str]]:
+    """使用 LibreOffice soffice 解析 DOCX 文件"""
+    # 检测 soffice 是否在 PATH 中
+    soffice_path = shutil.which("soffice")
+    if not soffice_path:
+        return None, "LibreOffice 未安装"
+
+    # 创建临时输出目录
+    with tempfile.TemporaryDirectory() as temp_dir:
+        temp_path = Path(temp_dir)
+        input_path = Path(file_path)
+        expected_output = temp_path / (input_path.stem + ".md")
+
+        # 构建命令
+        cmd = [
+            soffice_path,
+            "--headless",
+            "--convert-to", "md",
+            "--outdir", str(temp_path),
+            str(input_path)
+        ]
+
+        # 执行命令，超时 60 秒
+        try:
+            result = subprocess.run(
+                cmd,
+                capture_output=True,
+                text=True,
+                timeout=60
+            )
+        except subprocess.TimeoutExpired:
+            return None, "LibreOffice 转换超时 (60秒)"
+
+        # 检查返回码
+        if result.returncode != 0:
+            return None, f"LibreOffice 转换失败 (code: {result.returncode})"
+
+        # 检查输出文件是否存在
+        output_file = None
+        if expected_output.exists():
+            output_file = expected_output
+        else:
+            # Fallback: 遍历目录找任意 .md 文件
+            md_files = list(temp_path.glob("*.md"))
+            if md_files:
+                output_file = md_files[0]
+
+        if not output_file:
+            return None, "LibreOffice 未生成输出文件"
+
+        # 读取输出内容
+        content = output_file.read_text(encoding="utf-8", errors="replace")
+        content = content.strip()
+
+        if not content:
+            return None, "LibreOffice 输出为空"
+
+        return content, None