feat: add middleware to proxy requests to external generator

[FajarKim]

Description

Add middleware that acts as a proxy to forward all requests (except those directed to /api) to gh-readme-profile-generator.vercel.app. This middleware preserves the pathname and query string, and forwards relevant headers such as User-Agent and Accept. With this middleware in place, we can use an external generator without having to modify the frontend code directly.

Type of change

• Bug fix (added a non-breaking change which fixes an issue)
• New feature (added a non-breaking change which adds functionality)
• Updated documentation (updated the readme, templates, or other repo files)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Misc change (updated other files non-breaking change)

How Has This Been Tested?

• Tested locally with a valid username
• Tested locally with an invalid username
• Ran tests with npm test
• Added or updated test cases to test new features

Checklist:

• I have checked to make sure no other pull requests are open for this issue
• The code is properly formatted and is consistent with the existing code style
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Screenshots

None

[vercel]

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Project	Deployment	Actions	Updated (UTC)
github-readme-profile	Ready	Preview, Comment	Mar 23, 2026 10:41am

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.33%. Comparing base (d229ac0) to head (3b7f33e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #911   +/-   ##
=======================================
  Coverage   63.33%   63.33%           
=======================================
  Files          13       13           
  Lines         300      300           
  Branches       81       81           
=======================================
  Hits          190      190           
  Misses         88       88           
  Partials       22       22           

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