fix(http): allow projected MCP headers in preflights (#3167)

* fix(http): allow projected MCP headers in preflights

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* chore: regenerate license files

Auto-generated by license-check workflow

* fix(http): bound projected preflight headers

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>