[Bug]: No token limit was applied to the context when sending knowledge base content

[fungaegis]

Is there an existing issue for the same bug?

• I have checked the existing issues.

Branch name

main

Commit ID

196f2b4

Other environment information

No response

Actual behavior

携带知识库未对上下文做token限制, 导致经常出现 上下文超限

Expected behavior

对上下文进行限制, 动态删除过多的知识库内容, 避免触发上下文限制

Steps to reproduce

当chunk块过大时, 召回容易出现过载

api.db.services.dialog_service.message_fit_in 做了上下文限制, 但该上下文只对历史上下文做了限制

api.db.services.dialog_service.chat 168行 向openai请求时并未对召回的内容做限制

Additional information

No response