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fix: preserve GSI sort order and projection in getItemsPage

getItemsPage with a GSI index had two bugs compared to getItems:

1. Sort order not preserved: batchGetItems returns items in undefined
   order; the results were not reordered to match the GSI query order.

2. Projection missing key attributes: when projectedAttributes is
   specified, batchGetItems needs hash/range keys in its projection to
   perform the reordering lookup; then the final result must be trimmed
   to only the requested attributes.

Apply the same orderedItems logic that getItems uses (introduced in
PR #38) and handle projection trimming identically.

Add 3 new integration tests:
- Preserves ASC sort order via GSI
- Preserves DESC sort order via GSI
- Applies projection (trims key attributes after reordering)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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