init: WordFileParse docx→HTML 解析服务（含 Word EQ 域公式修复）

服务：Spring Boot 3.2 + docx4j 8.3.9，POST /api/v3/server_office_file/file/parse
      接受 .docx，返回 HTML（公式 → LaTeX，图片 → RustFS 外链）

公式支持三类来源：
- OMML（Word 2007+ 公式）      → Python omml_mathml2latex
- MathType OLE 对象            → Ruby mathtype2mathml → MathML → LaTeX
- Word EQ 域（老教辅主力）      → EqToLatexUtil（本次新增）

本次改动：
1. 新增 java-svc/.../core/EqToLatexUtil.java：
   移植自 jby backend-services office-core，EQ 语法 → LaTeX
   （\f→\dfrac、\r→\sqrt、\i→\int/\sum/\prod、\s→^{}/_{}、\b→\left\right、
     \a→array、\x→\boxed/\overline、\o\al 堆叠、圈码、化学符号、极限、连等式）
   品牌标记 JBYU* → WPU*，与采集端一致
2. CtoMathFinder：接上 EQ 分支（原为 not-ported 桩），域代码经
   EqToLatexUtil.convert 转 LaTeX 写入 eqLatexMap（WPEQNUM 占位符）
3. WordParseUtil.dealPlaceholder：EQ 的 LaTeX 同样加 \( \) 包裹
   （原先因 WPEQNUM 例外不加包裹，前端/MathJax 不渲染）

修前症状：教辅 Word 里分式/方程组/上下标整段丢失（如 {−1/3, 1} 变成 {－，1}）
修后实测：46 份教辅 2908 处 EQ 域全部还原，公式总数 2954 处、零未包裹残留

安全：application.yml（含 RustFS 密钥）不入库，提供 application.yml.example；
      OssService 的 @Value 默认密钥已清空

scripts/omml_mathml2latex/parsers/omml_parser.py

@@ -0,0 +1,183 @@
+"""
+OMML parser for Office Math Markup Language input.
+
+This parser handles OMML XML input from Microsoft Office, converting it
+to MathML format using the existing OMML processing pipeline.
+"""
+
+from typing import List
+from lxml import etree as ET
+from ..core.interfaces import Parser
+
+
+class OmmlParser(Parser):
+    """
+    Parser for OMML (Office Math Markup Language) XML input.
+
+    This parser handles OMML XML from Microsoft Office documents, converting
+    it to MathML using the existing OMML transformation pipeline.
+
+    Examples:
+        Single OMML equation:
+            >>> parser = OmmlParser()
+            >>> omml = '<m:oMath xmlns:m="http://..."><m:r><m:t>x</m:t></m:r></m:oMath>'
+            >>> results = parser.parse(omml)
+            >>> len(results) >= 1
+            True
+    """
+
+    def __init__(self):
+        """Initialize the OMML parser."""
+        pass
+
+    def parse(self, source: str) -> List[str]:
+        """
+        Parse OMML input and return list of MathML equation strings.
+
+        Args:
+            source: OMML XML string or file path
+
+        Returns:
+            List of MathML equation strings (converted from OMML)
+
+        Raises:
+            ValueError: If input is not valid OMML XML
+            RuntimeError: If OMML to MathML conversion fails
+
+        Examples:
+            >>> parser = OmmlParser()
+            >>> omml = '<m:oMath xmlns:m="http://...">...</m:oMath>'
+            >>> results = parser.parse(omml)
+            >>> isinstance(results, list)
+            True
+        """
+        import os
+
+        # Check if source is a file path
+        if os.path.exists(source):
+            try:
+                with open(source, 'r', encoding='utf-8') as f:
+                    source = f.read()
+            except (IOError, UnicodeDecodeError) as e:
+                raise ValueError(f"Failed to read OMML file: {e}")
+
+        # Parse XML
+        try:
+            root = ET.fromstring(source.encode('utf-8'))
+        except ET.XMLSyntaxError as e:
+            raise ValueError(f"Invalid XML syntax: {e}")
+
+        # Find all OMML math elements
+        # OMML uses <m:oMath> or <m:oMathPara> elements
+        omml_ns = {'m': 'http://schemas.openxmlformats.org/officeDocument/2006/math'}
+
+        # Find oMath elements (with or without namespace)
+        omath_elements = []
+        omath_elements.extend(root.findall('.//m:oMath', omml_ns))
+        omath_elements.extend(root.findall('.//m:oMathPara', omml_ns))
+
+        # Try without namespace (in case it's not declared)
+        if not omath_elements:
+            for elem in root.iter():
+                local_name = elem.tag.split('}')[-1] if '}' in elem.tag else elem.tag
+                if local_name in ('oMath', 'oMathPara'):
+                    omath_elements.append(elem)
+
+        if not omath_elements:
+            # Check if root itself is an OMML element
+            root_local = root.tag.split('}')[-1] if '}' in root.tag else root.tag
+            if root_local in ('oMath', 'oMathPara'):
+                omath_elements.append(root)
+            else:
+                raise ValueError("No OMML math elements (<m:oMath> or <m:oMathPara>) found in input")
+
+        # Convert each OMML element to MathML
+        results = []
+        for omml_elem in omath_elements:
+            try:
+                mathml_str = self._omml_to_mathml(omml_elem)
+                if mathml_str and mathml_str.strip():
+                    results.append(mathml_str)
+            except Exception as e:
+                # Log error but continue with other equations
+                print(f"Warning: Failed to convert OMML element: {e}")
+                continue
+
+        if not results:
+            raise RuntimeError("Failed to convert any OMML elements to MathML")
+
+        return results
+
+    def can_handle(self, source: str) -> bool:
+        """
+        Check if this parser can handle the given input source.
+
+        Args:
+            source: Input source to check
+
+        Returns:
+            True if source appears to be OMML, False otherwise
+
+        Examples:
+            >>> parser = OmmlParser()
+            >>> parser.can_handle("<m:oMath>...</m:oMath>")
+            True
+            >>> parser.can_handle("<math><mi>x</mi></math>")
+            False
+        """
+        # Check for OMML markers
+        content_start = source.strip()[:200]
+        return '<m:oMath' in content_start or '<m:oMathPara' in content_start
+
+    @property
+    def parser_type(self) -> str:
+        """Get the parser type identifier."""
+        return "omml"
+
+    def _omml_to_mathml(self, omml_element: ET.Element) -> str:
+        """
+        Convert OMML element to MathML string with styling preservation.
+
+        This wraps the existing OMML to MathML conversion from the core module,
+        and adds post-processing to preserve styling (bold, fonts, colors) that
+        the XSLT stylesheet doesn't preserve.
+
+        Args:
+            omml_element: OMML XML element
+
+        Returns:
+            MathML string with styling attributes
+
+        Raises:
+            RuntimeError: If conversion fails
+        """
+        # Import here to avoid circular dependencies
+        import os
+        from ..core import omml_to_mathml
+        from ..utils.styling_postprocessor import apply_styling_to_mathml_from_omml
+
+        try:
+            # Convert OMML element to string
+            omml_str = ET.tostring(omml_element, encoding='unicode')
+
+            # Get XSL path (in core module)
+            current_dir = os.path.dirname(os.path.abspath(__file__))
+            core_dir = os.path.join(os.path.dirname(current_dir), 'core')
+            xsl_path = os.path.join(core_dir, 'OMML2MML.xsl')
+
+            # Step 1: Use XSLT to convert OMML to MathML
+            mathml_str = omml_to_mathml(omml_str, xsl_path)
+
+            # Step 2: Post-process to add styling (bold, fonts, colors)
+            # The XSLT doesn't preserve m:sty, m:scr, w:color, etc.
+            # This step extracts styling from OMML and applies to MathML
+            mathml_str = apply_styling_to_mathml_from_omml(omml_str, mathml_str)
+
+            return mathml_str
+
+        except Exception as e:
+            raise RuntimeError(f"OMML to MathML conversion failed: {e}")
+
+    def __repr__(self) -> str:
+        """String representation for debugging."""
+        return "OmmlParser()"