🌐 Add Chinese translation for docs/zh/docs/advanced/behind-a-proxy.md

[jaystone776]

As title

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cf73051) 100.00% compared to head (ff0441d) 100.00%.
Report is 1086 commits behind head on master.

❗ Current head ff0441d differs from pull request most recent head dad7102. Consider uploading reports for the commit dad7102 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##            master     #3820     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
===========================================
  Files          540       410    -130     
  Lines        13969     10281   -3688     
===========================================
- Hits         13969     10281   -3688     

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[github-actions]

📝 Docs preview for commit ff0441d at: https://612ee38ed090273aae1ab710--fastapi.netlify.app

[tiangolo]

📝 Docs preview for commit dad7102 at: https://649a08becc19e50856cacc68--fastapi.netlify.app

[alejsdev]

Thank you @jaystone776 🚀✨

And thanks for the review @zy7y 🤓