feat(依赖): 添加 Mermaid 图表和 KaTeX 数学公式支持

- 添加 mermaid@11.12.2 用于流程图渲染
- 添加 katex@0.16.27 用于数学公式渲染
- 添加 remark-math 和 rehype-katex 插件
- 添加 @types/katex 类型定义

package.json

@@ -20,8 +20,10 @@
     "html2canvas": "^1.4.1",
     "jose": "^6.1.3",
     "jspdf": "^3.0.4",
+    "katex": "^0.16.27",
     "lucide-react": "^0.561.0",
     "mammoth": "^1.11.0",
+    "mermaid": "^11.12.2",
     "nanoid": "^5.1.6",
     "next": "16.0.10",
     "nodemailer": "^7.0.11",
@@ -31,7 +33,9 @@
     "react": "19.2.1",
     "react-dom": "19.2.1",
     "react-markdown": "^10.1.0",
+    "rehype-katex": "^7.0.1",
     "remark-gfm": "^4.0.1",
+    "remark-math": "^6.0.0",
     "sonner": "^2.0.7",
     "word-extractor": "^1.0.4",
     "xlsx": "^0.18.5",
@@ -40,6 +44,7 @@
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
     "@types/bcryptjs": "^3.0.0",
+    "@types/katex": "^0.16.7",
     "@types/node": "^20",
     "@types/nodemailer": "^7.0.4",
     "@types/pg": "^8.16.0",