chore: hostHeaders default value is empty string

[fengmk2]

closes #5411

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[Copilot]

Pull Request Overview

This PR updates the documentation for the default value of config.hostHeaders, changing it from "x-forwarded-host" to an empty string. It also adds clarifications for reverse proxy deployments in both Chinese and English versions of the docs.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
site/docs/basics/controller.zh-CN.md	Updated the default value documentation and added reverse proxy instructions.
site/docs/basics/controller.md	Revised the default configuration details and provided further proxy configuration guidance.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.69%. Comparing base (e440fad) to head (a61046e).
Report is 30 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5412       +/-   ##
===========================================
+ Coverage   88.36%   99.69%   +11.33%     
===========================================
  Files          39       35        -4     
  Lines        3772     3609      -163     
  Branches      342      538      +196     
===========================================
+ Hits         3333     3598      +265     
+ Misses        439       11      -428     

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