add configurable footer for disclaimer

[lancemao]

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1. Is this request related to a challenge you're experiencing?

almost every agent or LLM provider supports a tiny grey line at the bottom of the conversation for disclaimer. e.g. in Coze:

2. Describe the feature you'd like to see

suggest dify add the same. To be better than other Agents, it should be configurable as well. Say we have an IT FAQ, the disclainmer at the bottom could be something like this:

The content is generated by AI and it's for reference only. If you have any further questions, please contact Mike (mike@company.com)

3. How will this feature improve your workflow or experience?

will avoid illegal issue when delivered to our customer

4. Additional context or comments

No response

5. Can you help us with this feature?

• I am interested in contributing to this feature.