fix(eval): delete about memos redundant search branches

[Duguce]

Description

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Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

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• Unit Test
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Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes #xxxx (Replace xxxx with the GitHub issue number)
• Made sure Checks passed

[Copilot]

Pull Request Overview

This PR removes the deprecated "memos" search path from the search_query function to prevent redundant branch logic.

• Deleted the elif frame == "memos": branch.
• Consolidated search framing to only "zep" and "mem0".

[Copilot]

With the memos branch removed, passing frame="memos" will fall through and leave context and duration_ms uninitialized, causing a runtime error. Consider adding an else clause to explicitly handle unsupported frame values or raise a clear error.

[Ki-Seki]

This branch is out of date with the base branch. Please update it.

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该分支与基础分支不同步，请更新它。

[Duguce]

@Ki-Seki have updated the branch.