Defer provisionAsync() until after the transaction commits using
TransactionSynchronization.afterCommit(). Previously the @Async thread
raced the @Transactional commit — findById returned null because the
tenant INSERT wasn't visible yet.
Downgrade ClickHouse UNKNOWN_TABLE errors to DEBUG level in
InfrastructureService. These are expected on fresh installs before any
cameleer-server has created the tables.
Make the onboarding slug field read-only (derived from org name).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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