添加 StreamMarkdownRender 组件并更新相关依赖，优化聊天界面

package.json

@@ -18,6 +18,9 @@
   "dependencies": {
     "@tailwindcss/vite": "^4.1.15",
     "ant-design-vue": "~4.2.6",
+    "highlight.js": "^11.11.1",
+    "markdown-it": "^14.1.0",
+    "markdown-it-highlightjs": "^4.2.0",
     "pinia": "^3.0.3",
     "tailwindcss": "^4.1.15",
     "vue": "^3.5.22",
@@ -25,6 +28,7 @@
   },
   "devDependencies": {
     "@tsconfig/node22": "^22.0.2",
+    "@types/markdown-it": "^14.1.2",
     "@types/node": "^22.18.6",
     "@vitejs/plugin-vue": "^6.0.1",
     "@vue/eslint-config-prettier": "^10.2.0",