fix(server): catch synchronous exceptions in middleware passes

[pi0]

Summary

• Wraps middleware pass execution in _createProxyFn with try/catch to handle synchronous exceptions (e.g., ERR_INVALID_HTTP_TOKEN from invalid headers)
• When an error listener exists, the error is emitted via the error event; otherwise the promise rejects
• Adds regression tests for both error-listener and promise-rejection paths

Ref: http-party/node-http-proxy#1680

Test plan

• New test: synchronous pass error is forwarded to error event when listener exists
• New test: synchronous pass error rejects the promise when no error listener
• Full test suite passes (228 tests, 0 failures)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ac1f4585-4edd-4a6b-9e9c-eeae429e4641

📥 Commits

Reviewing files that changed from the base of the PR and between 11f3657 and 68e7c1d.

📒 Files selected for processing (2)

• src/server.ts
• test/index.test.ts

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch fix/forward-parsing-errors

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.26%. Comparing base (8ab2a3b) to head (68e7c1d).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
+ Coverage   96.14%   96.26%   +0.11%     
==========================================
  Files           8        8              
  Lines         623      643      +20     
  Branches      233      241       +8     
==========================================
+ Hits          599      619      +20     
  Misses         24       24              

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