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refactor: replace Object.assign({}) with {} in reduce initial values

Remove the unnecessary Object.assign({}) anti-pattern used as the initial
accumulator in Array.prototype.reduce() calls throughout DynamoDbRepository.ts.
Object.assign({}) with no additional arguments simply returns a new empty
object — identical to the literal {}. Using {} directly is cleaner and more
idiomatic TypeScript.

Also replaces Object.assign(removeAttributeNames) with {...removeAttributeNames}
in updateItem to make the intent explicit: the reduce starts with a shallow
copy of the removeAttributeNames object.

Affects 13 call sites across getItems, getItemsPage, updateItem, and
batchGetItems. No behavioural change.

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

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