fix(cli): preserve repeated HTTP headers

[xudongWu2022]

Closes #3

Summary:

• accumulate repeated --header values
• preserve last-wins behavior for other flags
• add focused CLI parser regression tests

Verification:

• npm test
• npm run lint

[github-actions]

Welcome, @xudongWu2022, and thanks for your first pull request to MCP-audit.

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[royalpinto007]

Merged, thanks @xudongWu2022. Accumulating only --header while leaving every other flag last-wins is the right call, and the test that asserts --config still overwrites is the one that stops this regressing later. The colons-in-values case was a good catch too. Verified locally: 50 tests, lint and typecheck clean.

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[github-actions]

Nice work @xudongWu2022, this is merged.

Genuinely helpful change for MCP-audit.

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Happy to see more from you whenever you have the time.