feat: 1.优化images样式表现。2.增加markdown浏览插件

package.json

@@ -27,6 +27,7 @@
         "axios": "^1.7.3",
         "codemirror": "^6.0.1",
         "lodash": "^4.17.21",
+        "markdown-it": "^14.1.0",
         "naive-ui": "^2.39.0",
         "pdfjs-dist": "^4.5.136",
         "sass": "^1.77.8",
@@ -37,6 +38,7 @@
     },
     "devDependencies": {
         "@types/lodash": "^4.17.7",
+        "@types/markdown-it": "^14.1.2",
         "@types/node": "^22.1.0",
         "@types/pdfjs-dist": "^2.10.378",
         "@vitejs/plugin-vue": "^5.1.2",