fix: disable auth when off chain service

[LinZexiao]

关联的Issues (Related Issues)

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改动 (Proposed Changes)

附注 (Additional Info)

自查清单 (Checklist)

在你认为本 PR 满足被审阅的标准之前，需要确保 / Before you mark the PR ready for review, please make sure that:

• 符合Venus项目管理规范中关于PR的相关标准 / The PR follows the PR standards set out in the Venus project management guidelines
• 具有清晰明确的commit message / All commits have a clear commit message.
• 包含相关的的测试用例或者不需要新增测试用例 / This PR has tests for new functionality or change in behaviour or not need to add new tests.
• 包含相关的的指南以及文档或者不需要新增文档 / This PR has updated usage guidelines and documentation or not need
• 通过必要的检查项 / All checks are green

[codecov-commenter]

Codecov Report

Merging #493 (fefcffe) into master (69d2399) will increase coverage by 0.02%.
The diff coverage is 0.00%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #493      +/-   ##
==========================================
+ Coverage   25.38%   25.40%   +0.02%     
==========================================
  Files         178      178              
  Lines       20938    20941       +3     
==========================================
+ Hits         5315     5320       +5     
+ Misses      14714    14713       -1     
+ Partials      909      908       -1     

Flag	Coverage Δ
unittests	25.40% <0.00%> (+0.02%)	⬆️

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

Files	Coverage Δ
config/config.go	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

[simlecode]

lgtm