deploy: use goproxy.cn and clarify private org

[CarlJi]

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[netlify]

✅ Deploy Preview for reviewbot-x canceled.

Name	Link
🔨 Latest commit	6301dc1
🔍 Latest deploy log	https://app.netlify.com/sites/reviewbot-x/deploys/66b9892525aa5b0009eb72d2

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 36.69%. Comparing base (7863a67) to head (6301dc1).

Files	Patch %	Lines
server.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #269   +/-   ##
=======================================
  Coverage   36.69%   36.69%           
=======================================
  Files          19       19           
  Lines        1420     1420           
=======================================
  Hits          521      521           
  Misses        858      858           
  Partials       41       41           

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