[feat][evaluation] prompt evaltarget support traj

[lsy357]

What type of PR is this?

feat

Check the PR title

• This PR title match the format: [<type>][<scope>] <description>. For example: [fix][backend] flaky fix
• The description of this PR title is user-oriented and clear enough for others to understand.
• Add documentation if the current PR requires user awareness at the usage level.
• This PR is written in English. PRs not in English will not be reviewed.

(Optional) Translate the PR title into Chinese

(Optional) More detailed description for this PR(en: English/zh: Chinese)

en:
zh(optional):

(Optional) Which issue(s) this PR fixes

[codecov]

Codecov Report

❌ Patch coverage is 56.52174% with 10 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ation/domain/service/expt_manage_execution_impl.go	33.33%	4 Missing ⚠️
...on/domain/service/target_source_loopprompt_impl.go	63.63%	3 Missing and 1 partial ⚠️
...ion/domain/service/expt_run_scheduler_mode_impl.go	60.00%	1 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (56.52%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

@@            Coverage Diff             @@
##             main     #458      +/-   ##
==========================================
- Coverage   74.36%   74.35%   -0.01%     
==========================================
  Files         629      629              
  Lines       65995    66012      +17     
==========================================
+ Hits        49078    49085       +7     
- Misses      13633    13646      +13     
+ Partials     3284     3281       -3     

Flag	Coverage Δ
unittests	74.35% <56.52%> (-0.01%)	⬇️

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

Files with missing lines	Coverage Δ
backend/modules/evaluation/domain/entity/target.go	93.93% <100.00%> (ø)
...ion/domain/service/expt_run_scheduler_mode_impl.go	84.54% <60.00%> (-0.16%)	⬇️
...ation/domain/service/expt_manage_execution_impl.go	68.97% <33.33%> (-1.14%)	⬇️
...on/domain/service/target_source_loopprompt_impl.go	89.48% <63.63%> (-0.76%)	⬇️

... and 1 file with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 74954fc...862f1c7. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.