Port of Rosmi720/XC_VM@2140b00f. A missing/corrupt MaxMind database or an
undefined HOST constant could fatal the stream request (white screen on live):
- GeoIPService::getIPInfo()/getISP() no longer construct the MaxMind reader
unguarded. A missing constant/binary or any reader error now yields false
instead of a fatal, via a shared readMmdb() helper (unit-tested).
- StreamRedirector::getStreamingURL() reads HOST through a defined() guard so
an undefined constant does not throw while resolving the broadcast domain.
Adapted to this tree: the added guards/try-catch were folded into readMmdb so
getIPInfo/getISP stay within the complexity ceiling.
