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

java-src/pool/OMml2MmlTransformerPool.java

@@ -0,0 +1,110 @@
+/*
+ * Decompiled with CFR 0.152.
+ * 
+ * Could not load the following classes:
+ *  com.jby.common.exceptions.BusinessException
+ *  org.apache.commons.pool2.BasePooledObjectFactory
+ *  org.apache.commons.pool2.PooledObject
+ *  org.apache.commons.pool2.PooledObjectFactory
+ *  org.apache.commons.pool2.impl.DefaultPooledObject
+ *  org.apache.commons.pool2.impl.GenericObjectPool
+ *  org.apache.commons.pool2.impl.GenericObjectPoolConfig
+ *  org.slf4j.Logger
+ *  org.slf4j.LoggerFactory
+ *  org.springframework.core.io.ClassPathResource
+ */
+package com.jby.officecore.pool;
+
+import com.jby.common.exceptions.BusinessException;
+import java.util.Objects;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.stream.StreamSource;
+import org.apache.commons.pool2.BasePooledObjectFactory;
+import org.apache.commons.pool2.PooledObject;
+import org.apache.commons.pool2.PooledObjectFactory;
+import org.apache.commons.pool2.impl.DefaultPooledObject;
+import org.apache.commons.pool2.impl.GenericObjectPool;
+import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.core.io.ClassPathResource;
+
+public enum OMml2MmlTransformerPool {
+    INSTANCE;
+
+    private static final Logger log;
+    private GenericObjectPool<Transformer> objectPool;
+
+    private OMml2MmlTransformerPool() {
+        GenericObjectPoolConfig poolConfig = new GenericObjectPoolConfig();
+        poolConfig.setMaxTotal(30);
+        poolConfig.setMinIdle(4);
+        poolConfig.setMaxIdle(8);
+        poolConfig.setBlockWhenExhausted(true);
+        poolConfig.setMaxWaitMillis(3000L);
+        poolConfig.setTestOnCreate(true);
+        poolConfig.setTestOnBorrow(true);
+        poolConfig.setTestOnReturn(true);
+        poolConfig.setTestWhileIdle(true);
+        PooledTransformerFactory objectFactory = new PooledTransformerFactory();
+        this.objectPool = new GenericObjectPool((PooledObjectFactory)objectFactory, poolConfig);
+    }
+
+    public Transformer borrowObject() {
+        log.info("\u8f6c\u6362\u5668\u6c60TransformerPool, \u7a7a\u95f2\u5bf9\u8c61\u6570\u91cf:{}, \u6d3b\u8dc3\u5bf9\u8c61\u6570\u91cf:{}, \u963b\u585e\u7b49\u5f85\u6570\u91cf:{},", new Object[]{this.objectPool.getNumIdle(), this.objectPool.getNumActive(), this.objectPool.getNumWaiters()});
+        try {
+            return (Transformer)this.objectPool.borrowObject();
+        }
+        catch (Exception e) {
+            log.error("\u4ece\u5bf9\u8c61\u6c60\u4e2d\u501f\u51fa\u5bf9\u8c61\u5f02\u5e38", (Throwable)e);
+            return null;
+        }
+    }
+
+    public void returnObject(Transformer transformer) {
+        log.info("\u8f6c\u6362\u5668\u6c60TransformerPool, \u7a7a\u95f2\u5bf9\u8c61\u6570\u91cf:{}, \u6d3b\u8dc3\u5bf9\u8c61\u6570\u91cf:{}, \u963b\u585e\u7b49\u5f85\u6570\u91cf:{},", new Object[]{this.objectPool.getNumIdle(), this.objectPool.getNumActive(), this.objectPool.getNumWaiters()});
+        if (Objects.nonNull(transformer)) {
+            this.objectPool.returnObject((Object)transformer);
+        }
+    }
+
+    static {
+        log = LoggerFactory.getLogger(OMml2MmlTransformerPool.class);
+    }
+
+    public static class PooledTransformerFactory
+    extends BasePooledObjectFactory<Transformer> {
+        private static final Logger log = LoggerFactory.getLogger(PooledTransformerFactory.class);
+        private static final TransformerFactory TRANSFORMER_FACTORY = TransformerFactory.newInstance();
+
+        public Transformer create() throws Exception {
+            return PooledTransformerFactory.buildTransformer();
+        }
+
+        public PooledObject<Transformer> wrap(Transformer transformer) {
+            return new DefaultPooledObject((Object)transformer);
+        }
+
+        public void destroyObject(PooledObject<Transformer> p) throws Exception {
+            super.destroyObject(p);
+        }
+
+        public boolean validateObject(PooledObject<Transformer> p) {
+            return Objects.nonNull(p.getObject());
+        }
+
+        private static Transformer buildTransformer() {
+            try {
+                ClassPathResource resource = new ClassPathResource("xsl/OMML2MML.XSL");
+                StreamSource xslSource = new StreamSource(resource.getInputStream());
+                return TRANSFORMER_FACTORY.newTransformer(xslSource);
+            }
+            catch (Exception e) {
+                log.error("\u751f\u6210\u8f6c\u6362\u5668\u5f02\u5e38", (Throwable)e);
+                throw new BusinessException("\u751f\u6210\u8f6c\u6362\u5668\u5f02\u5e38");
+            }
+        }
+    }
+}
+