Add helper for building paginated list response envelope with metadata fields

[Chucks1093]

Summary

All paginated list endpoints return a response envelope containing the data array alongside metadata like total, hasMore, and nextCursor. This envelope shape is currently assembled inline in each handler. A shared builder helper should be used everywhere to keep the shape consistent.

Scope

• Add buildListResponse<T>(data: T[], meta: { total: number, hasMore: boolean, nextCursor?: string }) helper
• Returns { data, meta: { total, hasMore, nextCursor } }
• nextCursor omitted from output when undefined
• Add unit tests confirming shape for: with cursor, without cursor, empty data array

Acceptance Criteria

• Returns correct envelope shape with all meta fields
• nextCursor absent when not provided
• Empty data array returns correct shape with total: 0 and hasMore: false

ETA: 12 hours

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[Ademiitura]

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[Unclebaffa]

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@Unclebaffa's PR #530 was approved and merged by @Chucks1093.

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