Updated client config with new major (3.x)

[sagzy]

ref TryGhost/Ghost#25646

• Activitypub frontend change in Updated ActivityPub to use dynamic topics and recommendations from API Ghost#25646 relies on two new API endpoints (/topics and /recommendations), and therefore has been shipped with a new major (3.x)
• With this change, we're saying: this version of the ActivityPub API is compatible with the frontend version 3.x
• More details on versioning in ADR: https://github.com/TryGhost/ActivityPub/blob/main/adr/0002-frontend-backend-versioning.md

[coderabbitai]

Walkthrough

The change updates hard-coded version numbers in the client configuration controller from version 2 to version 3. This affects the version string constant (changing to ^3.0.0) and the CDN URL reference (changing to ghost/activitypub@3). No function signatures, control flow, or logic modifications are present.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• This is a straightforward version number update in a single file with no structural or logic changes
• Verify that version 3 is the intended target version and aligns with other version references in the codebase
• Confirm the CDN URL format is correct for version 3

Pre-merge checks and finishing touches

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No description was provided by the author, making it impossible to assess if it relates to the changeset.	Add a pull request description explaining the rationale for bumping to version 3.0.0 and any relevant context for reviewers.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title directly reflects the main change: updating the client config to use major version 3.x instead of the previous version.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bump-frontend-to-3

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