feat: 聊天输入框支持粘贴图片 (Add image paste support to chat textarea)

[xgbstar1]

此拉取请求为聊天输入框添加了直接粘贴图片的功能。粘贴的图片通过新的工具函数 readImageFile 读取为数据 URL，并随后使用 appendImages 存储在聊天上下文中。此增强功能通过简化在聊天中分享图片的过程来改善用户体验。

更改内容：

• 实现 handlePaste 函数来处理粘贴图像。
• 修改 TextareaForm 以支持粘贴事件。
• 添加 readImageFile 工具函数来处理文件读取。

This pull request adds functionality to the chat textarea that allows users to paste images directly. The pasted images are read as data URLs using a new utility function readImageFile, and are then stored in the chat context with appendImages. This enhancement improves the user experience by simplifying the process of sharing images in chats.

Changes:

• Implement handlePaste function to process image pasting.
• Modify TextareaForm to support paste events.
• Add readImageFile utility function to handle file reading.

[vercel]

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[xcatliu]

LGTM