feat(xray): update xray-core to v26.9.8 and adapt panel

Bump xtls/xray-core to 37ceb8b4b6 (v26.9.8) and the three binary pins
(DockerInit.sh, release.yml Linux + Windows) in lockstep. No deleted
symbols; the impact is entirely on the JSON config surface.

Outbound "proxySettings" is now refused by the config loader (moved to
streamSettings.sockopt.dialerProxy) and a freedom outbound rejects
sockopt.addressPortStrategy. Either key in a stored template would keep
the core from starting after the upgrade, so a new OutboundRemovedKeysFix
seeder rewrites xrayTemplateConfig once: proxySettings.tag becomes
sockopt.dialerProxy (an existing dialerProxy wins) and addressPortStrategy
is dropped from freedom outbounds. Template saves and outbound
subscriptions already run through the vendored loader, so the new
refusals surface there with the core's own message.

REALITY no longer applies a built-in minClientVer (26.3.27) when the
field is empty. The form placeholder and the min/max hints in all 13
locales now say that empty means no minimum.

New upstream keys the Zod schemas would otherwise strip, with form
support where a sibling field already had it:
- blackhole response type "custom" with base64 customResponseData
- realm finalmask ipMode (dual/v4/v6) and portMapping (UPnP / NAT-PMP)
- quicParams brutalDisableLossCompensation, disableChromeParrot,
  disableGSO, disableStatelessReset
- hysteria masquerade proxy xForwarded
- wireguard outbound remoteDNS
- routing rule localOS

freedom.domainStrategy is only deprecated upstream (auto-migrated to
sockopt.domainStrategy with a warning) and is left untouched.

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

@@ -62,6 +62,23 @@ exports[`FinalMaskStreamSettingsSchema fixtures > parses quic-params byte-stably
 }
 `;
 
+exports[`FinalMaskStreamSettingsSchema fixtures > parses quic-params-flags byte-stably 1`] = `
+{
+  "quicParams": {
+    "brutalDisableLossCompensation": true,
+    "brutalDown": "100 mbps",
+    "brutalUp": "60 mbps",
+    "congestion": "brutal",
+    "disableChromeParrot": true,
+    "disableGSO": true,
+    "disablePathMTUDiscovery": false,
+    "disableStatelessReset": true,
+  },
+  "tcp": [],
+  "udp": [],
+}
+`;
+
 exports[`FinalMaskStreamSettingsSchema fixtures > parses realm-tls byte-stably 1`] = `
 {
   "tcp": [],

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

@@ -74,6 +74,17 @@ exports[`RuleObjectSchema fixtures > parses full byte-stably 1`] = `
 }
 `;
 
+exports[`RuleObjectSchema fixtures > parses local-os byte-stably 1`] = `
+{
+  "localOS": [
+    "linux",
+    "darwin",
+  ],
+  "outboundTag": "direct",
+  "type": "field",
+}
+`;
+
 exports[`RuleObjectSchema fixtures > parses minimal byte-stably 1`] = `
 {
   "outboundTag": "direct",

frontend/src/test/golden/fixtures/finalmask/quic-params-flags.json

@@ -0,0 +1,12 @@
+{
+  "quicParams": {
+    "congestion": "brutal",
+    "brutalUp": "60 mbps",
+    "brutalDown": "100 mbps",
+    "brutalDisableLossCompensation": true,
+    "disablePathMTUDiscovery": false,
+    "disableChromeParrot": true,
+    "disableGSO": true,
+    "disableStatelessReset": true
+  }
+}

frontend/src/test/golden/fixtures/rule/local-os.json

@@ -0,0 +1,5 @@
+{
+  "type": "field",
+  "localOS": ["linux", "darwin"],
+  "outboundTag": "direct"
+}

frontend/src/test/outbound-form-adapter.test.ts

@@ -264,6 +264,54 @@ describe('outbound-form-adapter: round-trip', () => {
     expect(withType.settings).toEqual({ response: { type: 'http' } });
   });
 
+  it('blackhole carries customResponseData only for the custom response type', () => {
+    const custom = formValuesToWirePayload(
+      rawOutboundToFormValues({
+        protocol: 'blackhole',
+        settings: { response: { type: 'custom', customResponseData: 'SFRUUC8xLjEgNDAz' } },
+      }),
+    );
+    expect(custom.settings).toEqual({
+      response: { type: 'custom', customResponseData: 'SFRUUC8xLjEgNDAz' },
+    });
+
+    const http = formValuesToWirePayload(
+      rawOutboundToFormValues({
+        protocol: 'blackhole',
+        settings: { response: { type: 'http', customResponseData: 'ignored' } },
+      }),
+    );
+    expect(http.settings).toEqual({ response: { type: 'http' } });
+  });
+
+  it('wireguard csv-joins remoteDNS on read and splits it on write', () => {
+    const wire = {
+      protocol: 'wireguard',
+      settings: {
+        secretKey: 'YFVmTVCBsLxXJCe4i+jK8PgD3S6vUqfZ4Zl0JVNDfHA=',
+        remoteDNS: ['1.1.1.1', '2606:4700:4700::1111'],
+        peers: [{ publicKey: 'pk', endpoint: 'wg.example.com:51820' }],
+      },
+    };
+    const form = rawOutboundToFormValues(wire);
+    if (form.protocol === 'wireguard') {
+      expect(form.settings.remoteDNS).toBe('1.1.1.1,2606:4700:4700::1111');
+    }
+    const back = formValuesToWirePayload(form);
+    expect((back.settings as { remoteDNS?: string[] }).remoteDNS).toEqual([
+      '1.1.1.1',
+      '2606:4700:4700::1111',
+    ]);
+
+    const unset = formValuesToWirePayload(
+      rawOutboundToFormValues({
+        protocol: 'wireguard',
+        settings: { secretKey: wire.settings.secretKey, peers: wire.settings.peers },
+      }),
+    );
+    expect((unset.settings as { remoteDNS?: string[] }).remoteDNS).toBeUndefined();
+  });
+
   it('dns rules normalize qType numeric strings, split domains, carry rCode', () => {
     const wire = {
       protocol: 'dns',