fix(Select): keep legacy DOM structure for single select without filterable

[RylanBot]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

💡 需求背景和解决方案

• fix(Select): improved label filtering #3891

📝 更新日志

• 本条 PR 不需要纳入 Changelog

tdesign-react

• fix(SelectInput): 修复 1.18.1 的调整，导致单选且未开启 filterable 时，valueDisplay 为自定义字符串导致的 DOM 结构变更问题

@tdesign-react/chat

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

[github-actions]

Size Change: 0 B

Total Size: 87.8 kB

ℹ️ View Unchanged

Filename	Size
packages/tdesign-react-aigc/es/_chunks/dep-54070fc7.js	65.1 kB
packages/tdesign-react-aigc/es/_util/reactify.js	3.89 kB
packages/tdesign-react-aigc/es/_util/useDynamicStyle.js	615 B
packages/tdesign-react-aigc/es/attachments/index.js	354 B
packages/tdesign-react-aigc/es/chat-actionbar/index.js	360 B
packages/tdesign-react-aigc/es/chat-engine/components/activity/index.js	285 B
packages/tdesign-react-aigc/es/chat-engine/components/activity/registry.js	1.01 kB
packages/tdesign-react-aigc/es/chat-engine/components/activity/render.js	1.62 kB
packages/tdesign-react-aigc/es/chat-engine/components/activity/types.js	106 B
packages/tdesign-react-aigc/es/chat-engine/components/index.js	491 B
packages/tdesign-react-aigc/es/chat-engine/components/provider/agent-state.js	558 B
packages/tdesign-react-aigc/es/chat-engine/components/toolcall/index.js	423 B
packages/tdesign-react-aigc/es/chat-engine/components/toolcall/registry.js	969 B
packages/tdesign-react-aigc/es/chat-engine/components/toolcall/render.js	2.86 kB
packages/tdesign-react-aigc/es/chat-engine/components/toolcall/types.js	208 B
packages/tdesign-react-aigc/es/chat-engine/hooks/index.js	436 B
packages/tdesign-react-aigc/es/chat-engine/hooks/useAgentActivity.js	841 B
packages/tdesign-react-aigc/es/chat-engine/hooks/useAgentState.js	1.29 kB
packages/tdesign-react-aigc/es/chat-engine/hooks/useAgentToolcall.js	851 B
packages/tdesign-react-aigc/es/chat-engine/hooks/useChat.js	933 B
packages/tdesign-react-aigc/es/chat-engine/index.js	772 B
packages/tdesign-react-aigc/es/chat-filecard/index.js	354 B
packages/tdesign-react-aigc/es/chat-loading/index.js	360 B
packages/tdesign-react-aigc/es/chat-markdown/index.js	406 B
packages/tdesign-react-aigc/es/chat-message/index.js	367 B
packages/tdesign-react-aigc/es/chat-sender/index.js	359 B
packages/tdesign-react-aigc/es/chat-thinking/index.js	387 B
packages/tdesign-react-aigc/es/chatbot/index.js	426 B
packages/tdesign-react-aigc/es/index.js	999 B
packages/tdesign-react-aigc/es/style/index.js	146 B

_{compressed-size-action::tdesign-react-chat}

[tdesign-bot]

TDesign Component Site Preview Open

Component	Preview
tdesign-react
@tdesign-react/chat

[pkg-pr-new]

• tdesign-react-demo

  npm i https://pkg.pr.new/Tencent/tdesign-react@4351
  

  npm i https://pkg.pr.new/Tencent/tdesign-react/@tdesign-react/chat@4351
  

commit: f7966c9

[github-actions]

Size Change: +21 B (0%)

Total Size: 923 kB

📦 View Changed

Filename	Size	Change
packages/tdesign-react/dist/tdesign.js	508 kB	+10 B (0%)
packages/tdesign-react/dist/tdesign.min.js	297 kB	+11 B (0%)

ℹ️ View Unchanged

Filename	Size
packages/tdesign-react/dist/reset.css	1.93 kB
packages/tdesign-react/dist/tdesign.css	60.9 kB
packages/tdesign-react/dist/tdesign.min.css	55.1 kB

_{compressed-size-action::tdesign-react}