fix: struct hybrid collapse validation

[zhengbuqian]

issue: #42148

fixing issues during review of #50369

[sre-ci-robot]

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[sre-ci-robot]

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[sre-ci-robot]

✅ CI Loop Results a26d2dd

Stage	Result	Duration	Tests
✅ Build	SUCCESS	10.0min	-
✅ Code-Check	SUCCESS	5.2min	-
✅ UT-GO	SUCCESS	17.5min	1020 passed
✅ UT-Integration	SUCCESS	23.6min	46 passed
✅ UT-CPP-Cov	SUCCESS	36.5min	7836 passed

Total: 65min | Pipeline | Artifacts

Overall Coverage: 71.3%
Diff Coverage: Go 100.0% (5 hit, 0 miss, 5 measurable lines, 0 unmeasured)
Diff Coverage HTML: view changed lines
Total Patch Coverage: 100.0% (5/5 measurable lines, 0 unmeasured)

[codecov]

Codecov Report

❌ Patch coverage is 86.95652% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.95%. Comparing base (385caab) to head (3342086).
⚠️ Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/proxy/struct_hybrid_search.go	76.92%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #50399      +/-   ##
==========================================
- Coverage   78.96%   78.95%   -0.02%     
==========================================
  Files        2239     2239              
  Lines      396917   396929      +12     
==========================================
- Hits       313441   313393      -48     
- Misses      73900    73948      +48     
- Partials     9576     9588      +12     

Components	Coverage Δ
Client	80.36% <ø> (-0.04%)	⬇️
Core	85.93% <ø> (ø)
Go	76.83% <86.95%> (-0.03%)	⬇️

Files with missing lines	Coverage Δ
internal/proxy/search_pipeline.go	74.81% <100.00%> (ø)
internal/proxy/task_search.go	74.25% <100.00%> (ø)
internal/proxy/struct_hybrid_search.go	63.00% <76.92%> (+0.89%)	⬆️

... and 33 files with indirect coverage changes

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[sre-ci-robot]

✅ CI Loop Results 3342086

Stage	Result	Duration	Tests
✅ Build	SUCCESS	9.9min	-
✅ Code-Check	SUCCESS	5.2min	-
✅ UT-GO	SUCCESS	17.8min	1020 passed
✅ UT-Integration	SUCCESS	23.6min	46 passed
✅ UT-CPP-Cov	SUCCESS	36.1min	7836 passed

Total: 69min | Pipeline | Artifacts

Overall Coverage: 57.8%
Diff Coverage: Go N/A (0 hit, 0 miss, 0 measurable lines, 28 unmeasured)
Diff Coverage HTML: view changed lines
Go Patch Warning: WARNING: Go patch coverage unavailable; changed Go lines did not match the coverage profile.
Total Patch Coverage: N/A (untrusted: changed source lines have no coverage data)

[SpadeA-Tang]

Why move this code snippet.