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/domain/bo/ImageBO.java

@@ -0,0 +1,123 @@
+/*
+ * Decompiled with CFR 0.152.
+ */
+package com.jby.officecore.domain.bo;
+
+import java.io.InputStream;
+import java.io.Serializable;
+
+public class ImageBO
+implements Serializable {
+    private static final long serialVersionUID = 6640950035295880234L;
+    private InputStream is;
+    private Double width;
+    private Double height;
+    private Integer pictureType;
+    private String pictureUrl;
+
+    public InputStream getIs() {
+        return this.is;
+    }
+
+    public Double getWidth() {
+        return this.width;
+    }
+
+    public Double getHeight() {
+        return this.height;
+    }
+
+    public Integer getPictureType() {
+        return this.pictureType;
+    }
+
+    public String getPictureUrl() {
+        return this.pictureUrl;
+    }
+
+    public ImageBO setIs(InputStream is) {
+        this.is = is;
+        return this;
+    }
+
+    public ImageBO setWidth(Double width) {
+        this.width = width;
+        return this;
+    }
+
+    public ImageBO setHeight(Double height) {
+        this.height = height;
+        return this;
+    }
+
+    public ImageBO setPictureType(Integer pictureType) {
+        this.pictureType = pictureType;
+        return this;
+    }
+
+    public ImageBO setPictureUrl(String pictureUrl) {
+        this.pictureUrl = pictureUrl;
+        return this;
+    }
+
+    public boolean equals(Object o) {
+        if (o == this) {
+            return true;
+        }
+        if (!(o instanceof ImageBO)) {
+            return false;
+        }
+        ImageBO other = (ImageBO)o;
+        if (!other.canEqual(this)) {
+            return false;
+        }
+        InputStream this$is = this.getIs();
+        InputStream other$is = other.getIs();
+        if (this$is == null ? other$is != null : !this$is.equals(other$is)) {
+            return false;
+        }
+        Double this$width = this.getWidth();
+        Double other$width = other.getWidth();
+        if (this$width == null ? other$width != null : !((Object)this$width).equals(other$width)) {
+            return false;
+        }
+        Double this$height = this.getHeight();
+        Double other$height = other.getHeight();
+        if (this$height == null ? other$height != null : !((Object)this$height).equals(other$height)) {
+            return false;
+        }
+        Integer this$pictureType = this.getPictureType();
+        Integer other$pictureType = other.getPictureType();
+        if (this$pictureType == null ? other$pictureType != null : !((Object)this$pictureType).equals(other$pictureType)) {
+            return false;
+        }
+        String this$pictureUrl = this.getPictureUrl();
+        String other$pictureUrl = other.getPictureUrl();
+        return !(this$pictureUrl == null ? other$pictureUrl != null : !this$pictureUrl.equals(other$pictureUrl));
+    }
+
+    protected boolean canEqual(Object other) {
+        return other instanceof ImageBO;
+    }
+
+    public int hashCode() {
+        int PRIME = 59;
+        int result = 1;
+        InputStream $is = this.getIs();
+        result = result * 59 + ($is == null ? 43 : $is.hashCode());
+        Double $width = this.getWidth();
+        result = result * 59 + ($width == null ? 43 : ((Object)$width).hashCode());
+        Double $height = this.getHeight();
+        result = result * 59 + ($height == null ? 43 : ((Object)$height).hashCode());
+        Integer $pictureType = this.getPictureType();
+        result = result * 59 + ($pictureType == null ? 43 : ((Object)$pictureType).hashCode());
+        String $pictureUrl = this.getPictureUrl();
+        result = result * 59 + ($pictureUrl == null ? 43 : $pictureUrl.hashCode());
+        return result;
+    }
+
+    public String toString() {
+        return "ImageBO(is=" + this.getIs() + ", width=" + this.getWidth() + ", height=" + this.getHeight() + ", pictureType=" + this.getPictureType() + ", pictureUrl=" + this.getPictureUrl() + ")";
+    }
+}
+