feat: 统一聊天 Markdown 渲染

- 新增 ChatTimeMarkdown 并在管理端、用户端聊天入口复用

- 收敛聊天页面重复 Markdown 样式，保留工具和思考块独立渲染

easyflow-ui-usercenter/packages/effects/common-ui/package.json

@@ -37,6 +37,7 @@
     "qrcode": "catalog:",
     "tippy.js": "catalog:",
     "vue": "catalog:",
+    "vue-element-plus-x": "catalog:",
     "vue-json-viewer": "catalog:",
     "vue-router": "catalog:",
     "vue-tippy": "catalog:"