feat(engine): 实现 DOCX 原生 OMML 数学公式、Mermaid 高清渲染与出版级公文排版

- 集成 mathml2omml 与 KaTeX，实现展示级公式 (<m:oMathPara>) 与行内公式 (<m:oMath>) 的微软原生矢量公式渲染
- 实现 svgToPngData 将 Mermaid 矢量图光栅化为 2.5x 视网膜清晰度的 PNG 图片嵌入 Word
- 重构公文抬头、4列受控签署栏、出版级三线表、keepNext 防孤行与带分割线的受控页眉页脚

Co-authored-by: Cursor <cursoragent@cursor.com>

web/package-lock.json

@@ -11,6 +11,7 @@
         "docx": "^9.7.1",
         "katex": "^0.18.7",
         "lucide-react": "^1.16.0",
+        "mathml2omml": "^0.5.0",
         "mermaid": "^11.17.2",
         "react": "^19.2.0",
         "react-dom": "^19.2.0",
@@ -2832,6 +2833,12 @@
         "node": ">= 20"
       }
     },
+    "node_modules/mathml2omml": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/mathml2omml/-/mathml2omml-0.5.0.tgz",
+      "integrity": "sha512-4eLs37a+TH+CL/M5XZZrlc75SNRJNPiZzIaeSSvH0UFCRaCdSYRHWvrlA7MUbeQks/z4sVhfg+GlcZhVVUHzqg==",
+      "license": "LGPL-3.0-or-later"
+    },
     "node_modules/mermaid": {
       "version": "11.17.2",
       "resolved": "https://registry.npmjs.org/mermaid/-/mermaid-11.17.2.tgz",

web/package.json

@@ -13,6 +13,7 @@
     "docx": "^9.7.1",
     "katex": "^0.18.7",
     "lucide-react": "^1.16.0",
+    "mathml2omml": "^0.5.0",
     "mermaid": "^11.17.2",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",