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/chemistry_data.py

@@ -0,0 +1,95 @@
+"""
+Chemistry-related data for equation formatting.
+
+This module contains chemical elements, groups, and variables used for
+detecting and formatting chemistry equations.
+"""
+
+# Multi-character chemical elements (2 chars)
+# These are STRONG indicators - their presence alone triggers chemistry detection
+MULTI_CHAR_ELEMENTS = {
+    # Period 2
+    'He', 'Li', 'Be', 'Ne',
+    # Period 3
+    'Na', 'Mg', 'Al', 'Si', 'Cl', 'Ar',
+    # Period 4
+    'Ca', 'Sc', 'Ti', 'Cr', 'Mn', 'Fe', 'Co', 'Ni', 'Cu', 'Zn',
+    'Ga', 'Ge', 'As', 'Se', 'Br', 'Kr',
+    # Period 5
+    'Rb', 'Sr', 'Zr', 'Nb', 'Mo', 'Tc', 'Ru', 'Rh', 'Pd', 'Ag', 'Cd',
+    'In', 'Sn', 'Sb', 'Te', 'Xe',
+    # Period 6
+    'Cs', 'Ba', 'La', 'Ce', 'Pr', 'Nd', 'Pm', 'Sm', 'Eu', 'Gd', 'Tb', 'Dy',
+    'Ho', 'Er', 'Tm', 'Yb', 'Lu', 'Hf', 'Ta', 'Re', 'Os', 'Ir', 'Pt',
+    'Au', 'Hg', 'Tl', 'Pb', 'Bi', 'Po', 'At', 'Rn',
+    # Period 7
+    'Fr', 'Ra', 'Ac', 'Th', 'Pa', 'Np', 'Pu', 'Am', 'Cm', 'Bk', 'Cf',
+    'Es', 'Fm', 'Md', 'No', 'Lr', 'Rf', 'Db', 'Sg', 'Bh', 'Hs', 'Mt', 'Ds',
+    'Rg', 'Cn', 'Nh', 'Fl', 'Mc', 'Lv', 'Ts', 'Og'
+}
+
+# Single-character chemical elements (1 char)
+# These need CONTEXT - only formatted as chemistry when chemistry equation is detected
+SINGLE_CHAR_ELEMENTS = {
+    'H',   # Hydrogen
+    'B',   # Boron
+    'C',   # Carbon
+    'N',   # Nitrogen
+    'O',   # Oxygen
+    'F',   # Fluorine
+    'P',   # Phosphorus
+    'S',   # Sulfur
+    'K',   # Potassium (but also common variable)
+    'V',   # Vanadium (but also common variable for volume)
+    'Y',   # Yttrium
+    'I',   # Iodine
+    'W',   # Tungsten
+    'U',   # Uranium
+}
+
+# All chemical elements (for formatting once chemistry is detected)
+ALL_CHEMICAL_ELEMENTS = MULTI_CHAR_ELEMENTS | SINGLE_CHAR_ELEMENTS
+
+# Chemical groups and radicals (strong indicators)
+CHEMICAL_GROUPS = {
+    'OH',   # Hydroxide
+    'SO',   # Sulfite/Sulfate (partial)
+    'NO',   # Nitrite/Nitrate (partial)
+    'CO',   # Carbonyl/Carbonate (partial)
+    'NH',   # Amine/Ammonium (partial)
+    'CH',   # Methine/Hydrocarbon (partial)
+    'PO',   # Phosphate (partial)
+    'ClO',  # Chlorate (partial)
+}
+
+# Common chemistry variables (should stay italic even in chemistry equations)
+# These are NOT chemical elements, they're variables used in chemistry
+# NOTE: Keep this list minimal to avoid conflicts with fragmented elements
+CHEMISTRY_VARIABLES = {
+    'c',   # Concentration
+    # NOTE: 'n' removed - conflicts with fragmented Mn (Manganese)
+    # NOTE: 'M' removed - conflicts with fragmented Mn, Mg (Magnesium)
+    'p',   # Pressure (but P is Phosphorus!)
+    'T',   # Temperature
+    'm',   # Mass
+    'R',   # Gas constant
+    'E',   # Energy (but E is also used in chemistry)
+    # NOTE: 'V' removed - conflicts with V (Vanadium)
+    # NOTE: 'K' removed - conflicts with K (Potassium)
+    # Generic math variables
+    'x', 'y', 'z',
+    'a', 'b', 'd', 'q',
+}
+
+# Chinese chemical conditions/terms
+CHINESE_CHEMICAL_TERMS = {
+    '高温',    # High temperature
+    '加热',    # Heating
+    '催化剂',  # Catalyst
+    '点燃',    # Ignition
+    '电解',    # Electrolysis
+    '控温',    # Temperature control
+    '加压',    # Pressurization
+    '光照',    # Light
+    '通电',    # Electrify
+}