feat: 优化markdown渲染

package.json

@@ -10,10 +10,13 @@
     "postinstall": "nuxt prepare"
   },
   "dependencies": {
+    "@codemirror/lang-javascript": "^6.2.2",
+    "@codemirror/state": "^6.5.1",
     "@pinia/nuxt": "^0.9.0",
     "@types/node": "^22.10.5",
     "bcryptjs": "^2.4.3",
     "better-sqlite3": "11.3.0",
+    "codemirror": "^6.0.1",
     "dayjs": "^1.11.13",
     "jsonwebtoken": "^9.0.2",
     "markdown-it": "^14.1.0",