* feat: refactor order and slot lifecycles to use datetime fields for time validation
* refactor: remove time fields from order and slot schemas to streamline data structure
* fix: correct time validation logic in order and slot lifecycles to ensure proper datetime comparisons
* fix: update order lifecycle validation to exclude only 'cancelled' state
* fix: add validation to ensure order times fall within the specified slot boundaries
* feat: integrate dayjs for improved datetime handling in order lifecycles
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* fix: enhance datetime validation in order and slot lifecycles to ensure accurate comparisons
* fix: standardize error messages in order and slot lifecycles for better clarity
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