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/visitors/ms_visitor.py

@@ -0,0 +1,85 @@
+r"""
+Visitor for <ms> (string literal) MathML elements.
+
+The <ms> element represents a string literal, typically displayed with
+surrounding quotes. It's used for text that should be treated as a literal
+string rather than mathematical notation.
+
+In LaTeX conversion, ms is converted to \text{} with quotes, similar to mtext.
+"""
+
+from lxml import etree as ET
+from ..core.interfaces import Visitor, Strategy
+from ..utils import local_name as _local, text_content as _text_content
+
+
+class MsVisitor(Visitor):
+    r"""
+    Handles <ms> (string literal) MathML elements.
+
+    Converts string literals to LaTeX \text{} with optional quotes.
+
+    Examples:
+        Simple string:
+            <ms>hello</ms>
+            → \text{"hello"}
+
+        String without lquote/rquote attributes:
+            <ms lquote="" rquote="">world</ms>
+            → \text{world}
+
+        Custom quotes:
+            <ms lquote="[" rquote="]">text</ms>
+            → \text{[text]}
+
+        Empty string:
+            <ms></ms>
+            → \text{""}
+
+    Note:
+        Default quotes are double quotes (") unless overridden by
+        lquote and rquote attributes.
+    """
+
+    def __init__(self, strategy: Strategy):
+        """Initialize the Ms visitor."""
+        super().__init__(strategy)
+
+    def visit(self, node: ET.Element) -> str:
+        r"""
+        Convert <ms> element to LaTeX \text{} with quotes.
+
+        Args:
+            node: The <ms> element to convert
+
+        Returns:
+            LaTeX string with \text{...} and quotes
+
+        Raises:
+            ValueError: If node is not a <ms> element
+        """
+        if not self.can_handle(node):
+            raise ValueError(f"MsVisitor cannot handle element '{node.tag}'")
+
+        # Get quote attributes (default to double quotes)
+        lquote = node.get("lquote", '"')
+        rquote = node.get("rquote", '"')
+
+        # Get text content
+        content = _text_content(node)
+
+        # Wrap in \text{} with quotes
+        return f"\\text{{{lquote}{content}{rquote}}}"
+
+    def can_handle(self, node: ET.Element) -> bool:
+        """Check if this visitor can handle the given node."""
+        return _local(node.tag) == 'ms'
+
+    @property
+    def element_name(self) -> str:
+        """Get the element name this visitor handles."""
+        return 'ms'
+
+    def __repr__(self) -> str:
+        """String representation for debugging."""
+        return f"MsVisitor(strategy={self.strategy.name})"