feat(api): Apply custom headers from the api command

[euxaristia]

Summary

gt api advertised a --header/-H flag, but the handler discarded it with _ = headers, so custom headers were never sent. This wires the flag through to the request. Useful for endpoints that need a non-default Accept, Content-Type, or other header.

Changes

internal/api/client.go

• Add RequestWithHeaders; Request now delegates to it with no extra headers, preserving the existing signature.
• Preserve custom headers across GET retries by cloning the original request headers onto the rebuilt request in doWithRetry.

internal/cmd/api.go

• Parse -H key:value headers and pass them to RequestWithHeaders for both the DELETE and general paths.
• Add splitHeader, which splits on the first colon and validates a non-empty key.

Test plan

• go build ./... clean
• go vet ./internal/api/ ./internal/cmd/ clean
• go test ./internal/api/ ./internal/cmd/ -run TestApi pass (8/8 api command tests)

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📥 Commits

Reviewing files that changed from the base of the PR and between d880cc3 and 9076583.

📒 Files selected for processing (2)

• internal/api/client.go
• internal/cmd/api.go

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