[feat][evaluation] big obj upgrade

[tpfz]

整理由多次修复/日志调整等形成的历史提交，合并为一次提交，便于回溯与发布。

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[CozeLoop]

Thanks for the big-object refactor. Overall the design around RecordDataStorage, S3 offloading, and on-demand loading via EvalTargetService looks consistent and safe. I left one inline comment about logging full EvaluatorInputData at info level, which may unnecessarily increase log volume and expose sensitive content.

[codecov]

Codecov Report

❌ Patch coverage is 82.32323% with 70 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...nd/modules/evaluation/infra/storage/record_data.go	79.00%	19 Missing and 19 partials ⚠️
.../modules/evaluation/application/eval_target_app.go	72.72%	5 Missing and 4 partials ⚠️
...aluation/domain/service/expt_run_item_turn_impl.go	88.46%	3 Missing and 3 partials ⚠️
...luation/infra/repo/target/eval_target_repo_impl.go	73.68%	4 Missing and 1 partial ⚠️
...ckend/modules/evaluation/infra/rpc/data/dataset.go	0.00%	3 Missing ⚠️
.../api/handler/coze/loop/apis/eval_target_service.go	0.00%	2 Missing ⚠️
...tion/infra/repo/evaluator/evaluator_record_impl.go	88.23%	1 Missing and 1 partial ⚠️
backend/modules/evaluation/pkg/utils/trim.go	91.66%	1 Missing and 1 partial ⚠️
backend/api/api.go	0.00%	1 Missing ⚠️
...modules/evaluation/domain/service/analysis_impl.go	0.00%	1 Missing ⚠️
... and 1 more

@@            Coverage Diff             @@
##             main     #447      +/-   ##
==========================================
+ Coverage   73.83%   73.94%   +0.10%     
==========================================
  Files         626      627       +1     
  Lines       64821    65170     +349     
==========================================
+ Hits        47860    48189     +329     
+ Misses      13711    13700      -11     
- Partials     3250     3281      +31     

Flag	Coverage Δ
unittests	73.94% <82.32%> (+0.10%)	⬆️

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

Files with missing lines	Coverage Δ
...modules/evaluation/application/eval_openapi_app.go	92.39% <100.00%> (ø)
...nd/modules/evaluation/application/evaluator_app.go	89.17% <100.00%> (ø)
...dules/evaluation/domain/entity/evaluator_record.go	100.00% <ø> (ø)
...nd/modules/evaluation/domain/entity/expt_result.go	52.75% <ø> (ø)
.../modules/evaluation/domain/entity/target_record.go	58.53% <ø> (ø)
...s/evaluation/domain/service/evaluation_set_impl.go	93.33% <100.00%> (ø)
...luation/domain/service/evaluation_set_item_impl.go	95.18% <100.00%> (ø)
...odules/evaluation/domain/service/evaluator_impl.go	74.43% <100.00%> (+0.05%)	⬆️
...evaluation/domain/service/evaluator_record_impl.go	87.09% <100.00%> (ø)
...ation/domain/service/evaluator_source_code_impl.go	85.09% <100.00%> (+0.04%)	⬆️
... and 23 more

... and 3 files with indirect coverage changes

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