[feat] open api eval other

[dsf86]

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[CozeLoop]

Performed server-side Go code review focused on concurrency safety, correctness, and API functionality. See inline comments for Must-Fix and Should-Fix items.

[dsf86]

invalid

[codecov]

Codecov Report

❌ Patch coverage is 80.24928% with 206 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...uation/application/convertor/experiment/openapi.go	79.30%	96 Missing and 58 partials ⚠️
...odules/evaluation/infra/metrics/experiment/init.go	20.00%	20 Missing ⚠️
...modules/evaluation/application/eval_openapi_app.go	92.73%	10 Missing and 7 partials ⚠️
...api/handler/coze/loop/apis/eval_open_apiservice.go	0.00%	12 Missing ⚠️
...ckend/modules/evaluation/infra/rpc/data/dataset.go	0.00%	2 Missing ⚠️
...on/domain/service/target_source_loopprompt_impl.go	87.50%	0 Missing and 1 partial ⚠️

@@            Coverage Diff             @@
##             main     #288      +/-   ##
==========================================
+ Coverage   68.07%   68.36%   +0.28%     
==========================================
  Files         568      570       +2     
  Lines       50554    51562    +1008     
==========================================
+ Hits        34414    35248     +834     
- Misses      13469    13576     +107     
- Partials     2671     2738      +67     

Flag	Coverage Δ
unittests	68.36% <80.24%> (+0.28%)	⬆️

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

Files with missing lines	Coverage Δ
...evaluation/application/convertor/common/openapi.go	100.00% <100.00%> (ø)
...nd/modules/evaluation/domain/entity/expt_result.go	57.29% <ø> (ø)
backend/modules/evaluation/domain/entity/param.go	54.54% <ø> (ø)
...tion/domain/service/evaluation_set_version_impl.go	92.59% <100.00%> (ø)
...evaluation/domain/service/expt_result_aggr_impl.go	74.20% <100.00%> (+0.04%)	⬆️
...d/modules/evaluation/domain/service/target_impl.go	75.16% <ø> (ø)
...on/domain/service/target_source_loopprompt_impl.go	89.48% <87.50%> (-0.43%)	⬇️
...ckend/modules/evaluation/infra/rpc/data/dataset.go	0.00% <0.00%> (ø)
...api/handler/coze/loop/apis/eval_open_apiservice.go	0.00% <0.00%> (ø)
...modules/evaluation/application/eval_openapi_app.go	91.80% <92.73%> (+0.56%)	⬆️
... and 2 more

... and 3 files with indirect coverage changes

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[CozeLoop]

Summary: This PR introduces open API endpoints and application/domain changes, but several handlers return empty payloads instead of invoking the generated Kitex client, breaking functional correctness and contracts. Additionally, the dataset RPC adapter ignores the new exact version filter, risking wrong version selection; and the metrics initialization uses sync.Once in a way that can permanently block initialization if meter==nil on the first call. Please address the Must-Fix handler delegations, wire the version filter correctly, and adjust metrics initialization semantics. Route annotations should also be aligned with the actual router paths.