feat(xray): update xray-core to v26.9.9 and follow the udpHop move

Bump xtls/xray-core to 52a412d9e2f5 (v26.9.9) and the three binary pins in
DockerInit.sh and release.yml in lockstep.

Upstream moved UDP port hopping out of finalmask.quicParams.udpHop and into a
standalone "udphop" UDP mask with a different shape (mode / interval /
remotePorts / remoteIPs). The old key is gone from QuicParams, and since the
config loader ignores unknown fields it is now silently dropped rather than
rejected — port hopping just stops.

The panel adapts where that key was live:

- Both link importers rebuilt quicParams.udpHop from the standard mport param,
  so an imported hysteria2 link produced an outbound that no longer hops. They
  now emit a udphop mask in intervalremote mode, which is what the old key did.
  The mode is required: UDPHop.Build() rejects an empty or unknown one.
- validFinalMaskUDPTypes and UdpMaskTypeSchema learn "udphop", otherwise the Go
  link generator strips the mask from every link and sub, and Zod strips it on
  the next form round trip.
- mport generation (Go and frontend) reads the mask first and keeps reading the
  legacy key, so inbounds stored before the upgrade still advertise their range.

On an inbound the old key was always inert — only hysteria's dialer consumed
it — so nothing regresses server-side and no migration is needed. udphop stays
out of the mask dropdown on purpose: it is client-only in core, which refuses
to wrap a server socket, and that form is shared with the inbound editor.

frontend/src/test/__snapshots__/finalmask.test.ts.snap

@@ -201,6 +201,25 @@ exports[`FinalMaskStreamSettingsSchema fixtures > parses tcp-mask byte-stably 1`
 }
 `;
 
+exports[`FinalMaskStreamSettingsSchema fixtures > parses udp-hop byte-stably 1`] = `
+{
+  "tcp": [],
+  "udp": [
+    {
+      "settings": {
+        "interval": "5-10",
+        "mode": "intervalremote",
+        "remoteIPs": [
+          "203.0.113.0/24",
+        ],
+        "remotePorts": "20000-50000",
+      },
+      "type": "udphop",
+    },
+  ],
+}
+`;
+
 exports[`FinalMaskStreamSettingsSchema fixtures > parses udp-mask byte-stably 1`] = `
 {
   "tcp": [],

frontend/src/test/golden/fixtures/finalmask/udp-hop.json

@@ -0,0 +1,13 @@
+{
+  "udp": [
+    {
+      "type": "udphop",
+      "settings": {
+        "mode": "intervalremote",
+        "interval": "5-10",
+        "remotePorts": "20000-50000",
+        "remoteIPs": ["203.0.113.0/24"]
+      }
+    }
+  ]
+}

frontend/src/test/inbound-link.test.ts

@@ -233,6 +233,37 @@ describe('genHysteriaLink', () => {
     expect(link.endsWith('#hop-test')).toBe(true);
   });
 
+  it('emits mport from the udphop mask xray-core 26.9.9 moved hopping to', () => {
+    const [, raw] = fixtures[0];
+    const withHop = {
+      ...raw,
+      settings: { ...(raw.settings as Record<string, unknown>), version: 2 },
+      streamSettings: {
+        ...(raw.streamSettings as Record<string, unknown>),
+        finalmask: {
+          udp: [
+            {
+              type: 'udphop',
+              settings: { mode: 'intervalremote', interval: '5-10', remotePorts: '30000-40000' },
+            },
+          ],
+        },
+      },
+    };
+    const typed = InboundSchema.parse(withHop);
+    const client = (raw.settings as { clients: Array<{ auth: string }> }).clients[0];
+
+    const link = genHysteriaLink({
+      inbound: typed,
+      address: 'example.test',
+      port: typed.port,
+      remark: 'hop-mask',
+      clientAuth: client.auth,
+    });
+
+    expect(link).toContain('mport=30000-40000');
+  });
+
   it('normalizes pinSHA256 to hex for base64, raw-hex and colon-hex pins (issue #4818)', () => {
     const [, raw] = fixtures[0];
     const base64Pin = 'yEfdI5XQl4wHgLggHEsomosoFZfUfCdfLXfT+W2N6cQ=';

frontend/src/test/outbound-link-parser.test.ts

@@ -443,7 +443,9 @@ describe('parseHysteria2Link', () => {
     expect((udp[0].settings as Record<string, unknown>).password).toBe('fromobfs');
   });
 
-  it('reconstructs udpHop from the standard mport param', () => {
+  // xray-core 26.9.9 ignores quicParams.udpHop; hopping is a 'udphop' UDP mask
+  // and its mode must be one the core's UDPHop.Build() accepts.
+  it('reconstructs a udphop mask from the standard mport param', () => {
     const out = parseHysteria2Link(
       'hysteria2://auth@srv:443?security=tls&mport=20000-50000#hy2-mport',
     );
@@ -451,16 +453,25 @@ describe('parseHysteria2Link', () => {
       string,
       unknown
     >;
-    const quic = finalmask.quicParams as Record<string, unknown>;
-    const udpHop = quic.udpHop as Record<string, unknown>;
-    expect(udpHop.ports).toBe('20000-50000');
-    expect(udpHop.interval).toBe('5-10');
+    const udp = finalmask.udp as Array<Record<string, unknown>>;
+    const hop = udp.find((mask) => mask.type === 'udphop');
+    expect(hop).toBeDefined();
+    const settings = hop!.settings as Record<string, unknown>;
+    expect(settings.remotePorts).toBe('20000-50000');
+    expect(settings.interval).toBe('5-10');
+    expect(settings.mode).toBe('intervalremote');
+    expect((finalmask.quicParams as Record<string, unknown> | undefined)?.udpHop).toBeUndefined();
   });
 
-  it('lets an fm= udpHop win over mport', () => {
+  it('lets an fm= udphop mask win over mport', () => {
     const fm = encodeURIComponent(
       JSON.stringify({
-        quicParams: { udpHop: { ports: '30000-40000', interval: '7-9' } },
+        udp: [
+          {
+            type: 'udphop',
+            settings: { mode: 'intervalremote', interval: '7-9', remotePorts: '30000-40000' },
+          },
+        ],
       }),
     );
     const link = `hysteria2://auth@srv:443?security=tls&mport=1-2&fm=${fm}#hy2-mport-fm`;
@@ -469,12 +480,11 @@ describe('parseHysteria2Link', () => {
       string,
       unknown
     >;
-    const udpHop = (finalmask.quicParams as Record<string, unknown>).udpHop as Record<
-      string,
-      unknown
-    >;
-    expect(udpHop.ports).toBe('30000-40000');
-    expect(udpHop.interval).toBe('7-9');
+    const udp = finalmask.udp as Array<Record<string, unknown>>;
+    expect(udp).toHaveLength(1);
+    const settings = udp[0].settings as Record<string, unknown>;
+    expect(settings.remotePorts).toBe('30000-40000');
+    expect(settings.interval).toBe('7-9');
   });
 
   it('round-trips the salamander packetSize (Gecko) under fm', () => {