v1.5.2: Unified Hook Pipeline & Transaction Lifecycle

v1.5.2

• Hook unification: autoIn → Rebind → Hook is now a unified pipeline. Begin/Commit/Rollback fire Hooks.
• NewDb → NewDB (rename).
• QueryEvent.OperationType is now OpType enum: OpQuery, OpExec, OpBegin, OpCommit, OpRollback.
• QueryEvent.RowsAffected and LastInsertID now populated on exec.
• Tx.CloseWithErr now fires Hooks on both success and failure (was only failure).