Distributions now read items from the distribution_items table instead of
requiring a pre-built binary data blob. This enables creating distributions
via simple SQL inserts rather than generating binary data manually.
Changes:
- Add getDistributionItems() to fetch items from distribution_items table
- Update handleMsgMhfApplyDistItem to build response from table data
- Move server-side rewards (points, RP) to handleMsgMhfAcquireDistItem
- Support G8+ item format (13 bytes per item)
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