migrationModels was missing ClientGroup and ClientGlobalTraffic, so both
migration directions silently dropped client groups and global client
traffic; the model list is now extracted to allModels and a parity test
keeps the two lists from drifting again. MigrateData runs its truncate
and copy inside one transaction so a failed import rolls back instead of
leaving the destination truncated (sequences resync after commit since
setval is non-transactional). New PrepareSQLiteForMigration rejects
uploads that are not a panel database and AutoMigrates old backups so
their missing tables cannot break the row copy.
MHSanaei