[FEATURE] 搜索工具支持从RunnableConfig获取数据

[noday]

Feature Description

搜索工具需要agent对应的知识库id用于对应向量库，需要获取智能体配置用于topK和召回分数，希望能从SearchContext中获取到RunnableConfig设置的metadata

Use Case

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Example:

As a developer, I want to [do something] so that [benefit].

Proposed Solution

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Alternatives Considered

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Additional Context

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• Related issues or discussions

Implementation Notes (optional)

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• Would you be willing to contribute this feature?

Priority

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• Critical - Blocking my use case
• High - Significantly improves workflow
• Medium - Nice to have
• Low - Minor improvement