fix(sub): apply host Allow Insecure to Hysteria2 subscription links

Host.AllowInsecure was only wired into the shared VLESS/VMess/Trojan/Shadowsocks
endpoint path (applyEndpointAllowInsecure). Hysteria/Hysteria2 builds its links
through its own applyExternalProxyHysteriaParams (raw hysteria2:// link) and
buildHysteriaProxy (Clash/Mihomo proxy), neither of which read the host's
allowInsecure flag, so a self-signed Hysteria2 host never got insecure=1 or
skip-cert-verify: true. Fixes #5865.

internal/sub/clash_service.go

@@ -336,6 +336,9 @@ func (s *SubClashService) buildHysteriaProxy(subReq *SubService, inbound *model.
 			}
 		}
 	}
+	if insecure, ok := ep["allowInsecure"].(bool); ok && insecure {
+		proxy["skip-cert-verify"] = true
+	}
 
 	// Salamander obfs (Hysteria2). Read the same finalmask.udp[salamander]
 	// block the subscription link generator uses.

internal/sub/service.go

@@ -1556,17 +1556,18 @@ func applyExternalProxyTLSParams(ep map[string]any, params map[string]string, se
 // the inbound's own — Hysteria external proxies are typically alternate
 // endpoints (port-hop / CDN) fronting the same certificate.
 func applyExternalProxyHysteriaParams(ep map[string]any, params map[string]string) {
-	pins, ok := externalProxyPins(ep["pinnedPeerCertSha256"])
-	if !ok {
-		return
-	}
-	hexPins := make([]string, 0, len(pins))
-	for _, p := range pins {
-		if s, ok := p.(string); ok {
-			hexPins = append(hexPins, hysteriaPinHex(s))
+	if pins, ok := externalProxyPins(ep["pinnedPeerCertSha256"]); ok {
+		hexPins := make([]string, 0, len(pins))
+		for _, p := range pins {
+			if s, ok := p.(string); ok {
+				hexPins = append(hexPins, hysteriaPinHex(s))
+			}
 		}
+		params["pinSHA256"] = strings.Join(hexPins, ",")
+	}
+	if ai, ok := ep["allowInsecure"].(bool); ok && ai {
+		params["insecure"] = "1"
 	}
-	params["pinSHA256"] = strings.Join(hexPins, ",")
 }
 
 // cloneStreamForExternalProxy returns a shallow clone of stream with