chore: remove deprecated //export LLGoVersion comment

[xgopilot]

Requested by @luoliwoshang

Summary

Removes the deprecated //export LLGoVersion comment from internal/env/version.go as it is no longer needed.

Changes

• Removed the //export LLGoVersion comment directive from the Version() function

Testing

• Ran go fmt ./... to ensure proper formatting
• Ran go test ./internal/env/... to verify the package tests pass
• All tests in the internal/env package pass successfully

Fixes #1385

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.98%. Comparing base (86cafff) to head (742bfd9).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1386   +/-   ##
=======================================
  Coverage   90.98%   90.98%           
=======================================
  Files          43       43           
  Lines       11287    11287           
=======================================
  Hits        10269    10269           
  Misses        859      859           
  Partials      159      159           

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[luoliwoshang]

@xushiwei