AR frontend: Hosted repository detail

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Part of epic Repository read (+ plumbing), slice 2.

Hosted repository detail view + empty state.

Scope

• Repository detail fields: description, packagesCount, createdAt + createdBy, lastUpdatedBy
• repository(path) resolver → AR get-repository endpoint
• BatchLoader join: createdBy / lastUpdatedBy → UserType
• Empty state

Design

• Hosted detail

Depends on

• Slice 1 (plumbing + Repository type)
• AR REST get-repository endpoint: artifact-registry S17