fix(outbound): carry ALPN, fingerprint and UDP mask when importing a Hysteria2 link (#4760)

parseHysteria2Link hardcoded alpn to h3 and never read fp, ech, or the fm (finalmask) param, so importing a Hysteria2 client URL as an outbound dropped the configured ALPN, fingerprint, and salamander UDP mask. Parse alpn (falling back to h3 only when absent), fp, ech, and the pcs pinned-cert key, and restore the UDP mask via applyFinalMaskParam.

frontend/src/lib/xray/outbound-link-parser.ts

@@ -404,6 +404,7 @@ export function parseHysteria2Link(link: string): Raw | null {
   const address = url.hostname;
   const port = Number(url.port) || 443;
   const params = url.searchParams;
+  const alpn = params.get('alpn');
   const stream: Raw = {
     network: 'hysteria',
     security: 'tls',
@@ -412,13 +413,14 @@ export function parseHysteria2Link(link: string): Raw | null {
     },
     tlsSettings: {
       serverName: params.get('sni') ?? '',
-      alpn: ['h3'],
-      fingerprint: '',
-      echConfigList: '',
+      alpn: alpn ? alpn.split(',') : ['h3'],
+      fingerprint: params.get('fp') ?? '',
+      echConfigList: params.get('ech') ?? '',
       verifyPeerCertByName: '',
-      pinnedPeerCertSha256: params.get('pinSHA256') ?? '',
+      pinnedPeerCertSha256: params.get('pcs') ?? '',
     },
   };
+  applyFinalMaskParam(stream, params);
   return {
     protocol: 'hysteria',
     tag: decodeRemark(url),