feat: 为表召回启用语义相似度搜索，改进召回失败建议模板#465
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dawdadsd wants to merge 1 commit intospring-ai-alibaba:mainfrom
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Describe what this PR does / why we need it
对无用的表不进行召回，并且召回失败后提供改进后的建议模板，使业务人员能够继续探索
Does this pull request fix one issue?
Fix#463
Describe how you did it
新增 similaritySearch(SearchRequest) 接口，支持原生的向量相似度检索。
在表召回阶段引入语义搜索，并配合预设的相似度阈值，确保只有真正相关的表进入上下文。
当语义召回结果为空时，自动回退至元数据过滤模式，防止因向量库偏差导致召回中断。
改进召回失败时的建议问题模板，确保生成的建议能覆盖 3 个不同的业务表，提升用户探索意图的命中率。
Describe how to verify it
可以询问单表：即有哪些用户
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