XMPP::ConnectionResolver
Resolves how and where a client should connect, combining explicit configuration with optional XEP-0368 SRV discovery.
Class methods
Returns the ordered list of endpoints to try.
When the caller pinned an explicit host, or direct-TLS discovery is not requested, the sole endpoint is the configured host/port in STARTTLS mode (the original behavior).
When prefer_direct_tls is enabled and no host was pinned, both _xmpps-client and _xmpp-client SRV records are looked up and merged per XEP-0368 ยง3, preferring direct-TLS targets first. If discovery returns nothing, the client falls back to the configured host/port with STARTTLS (matching a "." target or absent records).