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feat: add scanPage for cursor-based scan pagination

Add a `scanPage` method to `DynamoDbRepository` that mirrors
`getItemsPage`: it accepts the same `ScanQuery` options plus an optional
`cursor` and returns a `PageResult<T>` with `items` and an optional next
`cursor`. Cursors are base64-encoded `LastEvaluatedKey` values, identical
to `getItemsPage`, keeping the pagination API consistent across query and
scan.

Uses `ScanCommand` directly (not `paginateScan`) so the native
`LastEvaluatedKey`/`ExclusiveStartKey` cursor can be exposed.

Also documents scan/getItemsPage/scanPage in the README methods table.

Closes #100

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

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