refactor(math): align FHT function names with zvec

[zhangzhenghao]

Summary

• align AVX2, AVX512, and NEON FHT C function names with Alibaba zvec
• update generated Go declarations and assembly symbols
• update amd64 and arm64 call sites to use the aligned names

Testing

• make generate
• go test ./internal/ailego/math -count=1
• GOOS=linux GOARCH=arm64 go test -c ./internal/ailego/math -o /tmp/xvec-ailego-math-arm64.test
• go test ./... -count=1

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Status	Name	Latest Commit	Updated (UTC)
❌ Deployment failed View logs	xvec	7857aee	Aug 31 2026, 12:50 PM

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.37%. Comparing base (d488a95) to head (7857aee).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/ailego/math/fht_amd64.go	50.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
- Coverage   82.45%   82.37%   -0.09%     
==========================================
  Files         122      122              
  Lines       26066    26066              
==========================================
- Hits        21494    21473      -21     
- Misses       4572     4593      +21     

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