Adds an e2e suite (tests/e2e/utls_test.go + testdata/utls/*)
that exercises the utls dialer in a forward-proxy chain:
curl -> client gost (http proxy :8080)
-> chain node (http connector + utls dialer)
-> server gost (http over TLS listener :8443)
-> tcp-echo
Two cases:
- TestUTLSInsecure: regression for go-gost/gost#887. A utls
dialer with `secure: false` must still complete the handshake
(InsecureSkipVerify must be honoured). The old unsafe cast read
garbage for InsecureSkipVerify and the handshake failed.
- TestUTLSSecureWithCA: exercises the converter's RootCAs /
ServerName path with a CA-signed server cert.
Uses the deterministic `Chrome` fingerprint (not `randomized`, which
randomises the ClientHello and is flaky against a standard Go TLS
server).
Bumps github.com/go-gost/x to v0.13.11, which fixes the
second half of #887: the curve-preference enum divergence between
crypto/tls and utls (Go 1.24+ appends PQC hybrid curves that
utls does not define).
Related: go-gost/gost#887, go-gost/x#111, go-gost/x#112
ginuerzh