Improve MySQL balance consistency across multiple servers#74
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Summary
This PR improves balance consistency when ExcellentEconomy is used with MySQL across multiple servers.
Previously, balances were updated in local memory and later saved through dirty user-data updates. In a high-concurrency multi-server setup, this could allow stale cached balances to overwrite newer values, cause race conditions during player payments, or create duplicate user rows during concurrent first-login inserts.