支持消息 Markdown 与欢迎语富文本

聊天/离线提示使用 Markdown 安全渲染；欢迎语改为 TipTap 富文本（颜色字号），DOMPurify 白名单清洗后展示。

web/package.json

@@ -13,13 +13,26 @@
     "@ant-design/charts": "^2.6.7",
     "@ant-design/icons": "^6.3.2",
     "@tailwindcss/vite": "^4.3.2",
+    "@tiptap/extension-color": "^3.28.0",
+    "@tiptap/extension-link": "^3.28.0",
+    "@tiptap/extension-text-align": "^3.28.0",
+    "@tiptap/extension-text-style": "^3.28.0",
+    "@tiptap/extension-underline": "^3.28.0",
+    "@tiptap/pm": "^3.28.0",
+    "@tiptap/react": "^3.28.0",
+    "@tiptap/starter-kit": "^3.28.0",
     "antd": "^6.5.1",
+    "dompurify": "^3.4.12",
     "react": "^19.2.7",
     "react-dom": "^19.2.7",
+    "react-markdown": "^10.1.0",
     "react-router-dom": "^7.18.1",
+    "rehype-sanitize": "^6.0.0",
+    "remark-gfm": "^4.0.1",
     "tailwindcss": "^4.3.2"
   },
   "devDependencies": {
+    "@types/dompurify": "^3.0.5",
     "@types/node": "^24.13.2",
     "@types/react": "^19.2.17",
     "@types/react-dom": "^19.2.3",