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/data/operators.py

@@ -0,0 +1,65 @@
+"""
+Operator and symbol set definitions for MathML to LaTeX conversion.
+
+This module provides:
+- Mathematical symbol sets for symbol detection
+- Summation symbol mappings
+- Font to LaTeX command mappings
+- Large operator definitions (Unicode versions)
+"""
+
+# Mathematical symbol set for symbol detection
+MATH_SYMBOLS_SET = {
+    "↑", "↓", "→", "←", "↔", "×", "⋅", "·", "÷", "∕", "−",  # Added U+2212 MINUS SIGN
+    "∩", "∪", "⊂", "⊃", "⊆", "⊇", "∈", "∉", "∋", "∌",
+    "≤", "≥", "≠", "≈", "≅", "≡", "≢", "∼", "≃", "≄",
+    "≜", "≝", "≞", "≟", "≦", "≧", "≨", "≩", "≲", "≳", "≴", "≵", "≶", "≷", "≸", "≹",
+    "≺", "≻", "⪯", "⪰", "∝", "⊥",
+    "∥", "∦", "±", "∓", "∗", "∘", "∙", "√", "∞",
+    "∂", "∇", "∆", "∫", "∬", "∭", "∮", "∯", "∰",
+    "∑", "∏", "∐", "⋃", "⋂", "⋁", "⋀", "⨁", "⨂", "⨄",
+    "∀", "∃", "∄", "⊢", "⊣", "⊤", "⊥", "¬", "∧", "∨",
+    "⟨", "⟩", "⌊", "⌋", "⌈", "⌉", "⏞", "⏟", "∠", "∁"
+}
+
+# Summation symbols for specific processing
+SUMMATION_SYMBOLS = {
+    '∑': 'sum',
+    '∏': 'prod',
+    '∫': 'integral',
+    'Σ': 'sum',
+    'Π': 'prod'
+}
+
+# Font family to LaTeX command mapping
+FONT_TO_LATEX = {
+    'Times New Roman': 'mathrm',   # Roman/upright text
+    'Times': 'mathrm',             # Times font variant
+    'Cambria Math': None,          # Default math font (no special formatting)
+    'Cambria': None,               # Cambria variant
+    'Arial': 'mathsf',             # Sans-serif
+    'Helvetica': 'mathsf',         # Helvetica sans-serif
+    'Courier New': 'mathtt',       # Typewriter/monospace
+    'Courier': 'mathtt',           # Courier variant
+    'Computer Modern': None,       # LaTeX default math font
+    'Latin Modern Math': None,     # Modern LaTeX math font
+}
+
+# Large operators that should use \limits in display mode (LaTeX commands)
+LARGE_OPERATORS = [
+    "\\sum", "\\prod", "\\int", "\\iint", "\\iiint", "\\oint",
+    "\\bigcup", "\\bigcap", "\\bigvee", "\\bigwedge",
+    "\\bigoplus", "\\bigotimes", "\\biguplus", "\\coprod",
+    "\\lim", "\\limsup", "\\liminf", "\\sup", "\\inf",
+    "\\max", "\\min"
+]
+
+# Unicode large operators for detection
+LARGE_OPERATORS_UNICODE = [
+    "∑", "Σ",        # Summation
+    "∏", "Π",        # Product
+    "∫",             # Integral
+    "⋃", "⋂",        # Union, Intersection
+    "⋁", "⋀",        # Logical OR, AND
+    "⨁", "⨂", "⨄",  # Direct sum, tensor product, union
+]