fix(server/events): capture identifiers before async user lookup

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Description

onPlayerConnecting read license synchronously but only called getIdentifiers(src) after awaiting storage.fetchUserByIdentifier. If another playerConnecting handler rejects the connection during that await, the temporary source can already be invalid, so the snapshot only contains username and createUser inserts a row with NULL license/license2/fivem/discord. Those rows are never matched again, so every retried rejected connection adds another.

The identifier snapshot is now taken at the same point as license, before the deferral yields, so a created row always carries the identifiers it is looked up by.

Related Issues

Fixes #772

Type of Change

• Bug fix

Testing

Code-path review of onPlayerConnecting, getIdentifiers, createUser and Login; luacheck reports no new warnings. Not tested on a live server.