feat: add broadcasts.clicked_links() method

[dielduarte]

Adds GET /broadcasts/{id}/clicked-links — paginated list of a broadcast's clicked links (url, clicks, unique_clicks).

Spec: resend/resend-openapi#95
Reference implementation: resend/resend-node#1077

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Summary by cubic

Adds Resend::Broadcasts.clicked_links to list a broadcast’s clicked links via GET /broadcasts/{id}/clicked-links, enabling paginated click analytics. No behavior changes to existing methods.

• Returns a paginated list of link objects with id, url, clicks, and unique_clicks.
• Forwards limit, after, and before via Resend::PaginationHelper; specs cover response shape and all pagination params.

^{Written for commit 9b0d877. Summary will update on new commits.}

[cubic-dev-ai]

All reported issues were addressed across 2 files

<sub>Reply with feedback, questions, or to request a fix.

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[cubic-dev-ai]

0 issues found across 1 file (changes from recent commits).

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

<sub>Requires human review: This PR adds the clicked_links method to the Resend::Broadcasts module, supporting a new API endpoint for broadcast click analytics and expanding the SDK's public interface.

Re-trigger cubic</sub>

[cubic-dev-ai]

0 issues found across 1 file (changes from recent commits).

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

<sub>Requires human review: Adds a new public clicked_links SDK method wrapping a new broadcast analytics endpoint, expanding the public contract; no visible evidence of prior human approval for this interface addition.

Re-trigger cubic</sub>