[feat][evaluation]report search

[tpfz]

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• This PR title match the format: [<type>][<scope>]: <description>. For example: [fix][backend] flaky fix
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[CozeLoop]

Summary: Posted inline review comments focusing on correctness and deployment consistency. One [MUST FIX] issue (SQL args mismatch when itemIDs is empty) and several [SHOULD FIX]/[SUGGESTION] items for performance/config clarity and Helm values consistency.

[codecov]

Codecov Report

❌ Patch coverage is 81.35593% with 11 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...experiment/ck/convertor/expt_turn_result_filter.go	53.84%	5 Missing and 1 partial ⚠️
...nfra/repo/experiment/ck/expt_turn_result_filter.go	90.90%	4 Missing ⚠️
backend/modules/evaluation/pkg/conf/expt.go	0.00%	1 Missing ⚠️

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
+ Coverage   68.47%   68.52%   +0.04%     
==========================================
  Files         569      569              
  Lines       51739    51676      -63     
==========================================
- Hits        35430    35410      -20     
+ Misses      13563    13536      -27     
+ Partials     2746     2730      -16     

Flag	Coverage Δ
unittests	68.52% <81.35%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...po/experiment/expt_turn_result_filter_repo_impl.go	88.14% <100.00%> (+0.08%)	⬆️
backend/modules/evaluation/pkg/conf/expt.go	0.00% <0.00%> (ø)
...nfra/repo/experiment/ck/expt_turn_result_filter.go	70.68% <90.90%> (-1.10%)	⬇️
...experiment/ck/convertor/expt_turn_result_filter.go	36.84% <53.84%> (-3.55%)	⬇️

... and 6 files with indirect coverage changes

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