自订 prompt || Custom prompt

[bee10301]

Is your feature request related to a problem? Please describe.
使用 ai 对话时，希望可以自订预设 prompt ，使回答更個性化

Describe the solution you'd like
在设定的 ai 选项中，添加自订 prompt 的栏位，当读取为空时，则填入预设的 prompt（如果有），这样对于只是想微调的用户也比较方便。

Describe alternatives you've considered
现在只能每次对话开头先写入 prompt

Additional context
无

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Is your feature request related to a problem? Please describe.
When using AI dialogue, I hope to customize the default prompt to make the answer more personalized.

Describe the solution you'd like
In the set ai options, add a custom prompt field. When the read is empty, fill in the default prompt (if any). This is also more convenient for users who just want to fine-tune.

Describe alternatives you've considered
Now you can only write prompt at the beginning of each conversation.

Additional context
none

[BryceWG]

这个未来可能作为小插件形式实现

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This may be implemented as a small plug-in in the future