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Introduce shadow tickets for export replay protection: - ltSHADOW_TICKET ledger entry: account-owned, keyed by account + ticket sequence. Fields: sfAccount, sfTicketSequence, sfTransactionHash, sfLedgerSequence, sfOwnerNode. - ExportLedgerOps::createShadowTicket(): creates shadow ticket when exported tx has sfTicketSequence. Charges owner reserve. Called from both hook xport() path and Export transactor. - ExportLedgerOps::cancelShadowTicket(): deletes shadow ticket, frees reserve. Used by xport_cancel hook API. - xport_cancel(ticket_seq) hook API: allows hooks to cancel shadow tickets for exports that will never get a callback. - InvariantCheck: add ltSHADOW_TICKET to valid entry types. - Test: verify shadow ticket creation with correct fields and owner count bump via ttEXPORT with TicketSequence.