fix(web-outgoing): include HTTP 303 in redirect location rewriting

[pi0]

Summary

• The redirectRegex in setRedirectHostRewrite was missing status code 303 (See Other), so hostRewrite, autoRewrite, and protocolRewrite options did not apply to 303 redirect responses.
• Added 303 to the regex and updated all three redirect rewrite test loops to cover it.

Upstream PR: http-party/node-http-proxy#1125

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d2574959-3485-4845-b326-731070dbf44c

📥 Commits

Reviewing files that changed from the base of the PR and between f30f90f and 1c5a572.

📒 Files selected for processing (3)

• AGENTS.md
• src/middleware/web-outgoing.ts
• test/middleware/web-outgoing.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/303-redirect-rewrite

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.12%. Comparing base (f30f90f) to head (1c5a572).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #119   +/-   ##
=======================================
  Coverage   96.12%   96.12%           
=======================================
  Files           8        8           
  Lines         645      645           
  Branches      243      243           
=======================================
  Hits          620      620           
  Misses         24       24           
  Partials        1        1           

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