hysteria: also accept "hysteria2" protocol string

UI stores v1 and v2 both as "hysteria" with settings.version, but
inbounds that came in from imports / manual SQL can carry the
literal "hysteria2" string and get silently dropped everywhere we
switch on protocol.

Add Hysteria2 constant + IsHysteria helper, use it in the places
that gate on protocol (sub SQL, getLink, genHysteriaLink, clash
buildProxy, json gen, inbound.go validation, xray AddUser).

Existing "hysteria" inbounds are untouched.

closes #4081

1 files changed, 4 insertions, 7 deletions

diff --git a/sub/subClashService.go b/sub/subClashService.go
index d0445aa4..7b6b8214 100644
--- a/sub/subClashService.go
+++ b/sub/subClashService.go
@@ -159,13 +159,10 @@ func (s *SubClashService) getProxies(inbound *model.Inbound, client model.Client
 }
 
 func (s *SubClashService) buildProxy(inbound *model.Inbound, client model.Client, stream map[string]any, extraRemark string) map[string]any {
-	// Hysteria (v1 / v2) doesn't ride an xray `streamSettings.network`
-	// transport and the TLS story is handled inside hysteria itself, so
-	// applyTransport / applySecurity below don't model it. Build the
-	// proxy directly. Without this, hysteria inbounds fell into the
-	// `default: return nil` branch and silently vanished from the
-	// generated Clash config.
-	if inbound.Protocol == model.Hysteria {
+	// Hysteria has its own transport + TLS model, applyTransport /
+	// applySecurity don't fit. IsHysteria also covers the literal
+	// "hysteria2" protocol string (#4081).
+	if model.IsHysteria(inbound.Protocol) {
 		return s.buildHysteriaProxy(inbound, client, extraRemark)
 	}