refactor(frontend): lift OutboundProtocols + OutboundDomainStrategies to schemas/primitives

Moves the two outbound-side consts out of models/outbound.ts and into
schemas/primitives/outbound-protocol.ts. Renames the export to
OutboundProtocols to disambiguate from the inbound Protocols const
(different key casing — PascalCase vs ALL CAPS — and partly different
member set, so they cannot share a single const).

OutboundsTab.tsx keeps its 15+ Protocols.X call sites by aliasing
the import. FinalMaskForm.tsx and BasicsTab.tsx swap directly.
Drops a stale `as string[]` cast in BasicsTab that no longer fits
the new readonly-tuple typing.

After this commit only the two big form modals
(InboundFormModal/OutboundFormModal) plus three intentional parity
tests still import from @/models/.

frontend/src/components/FinalMaskForm.tsx

@@ -3,7 +3,7 @@ import { Button, Divider, Form, Input, InputNumber, Select, Switch } from 'antd'
 import { DeleteOutlined, PlusOutlined, ReloadOutlined } from '@ant-design/icons';
 
 import { RandomUtil } from '@/utils';
-import { Protocols } from '@/models/outbound';
+import { OutboundProtocols } from '@/schemas/primitives';
 
 interface StreamShape {
   network?: string;
@@ -84,7 +84,7 @@ function newNoiseItem(): ItemRow {
 }
 
 export default function FinalMaskForm({ stream, protocol, onChange }: FinalMaskFormProps) {
-  const isHysteria = protocol === Protocols.Hysteria || protocol === 'hysteria';
+  const isHysteria = protocol === OutboundProtocols.Hysteria || protocol === 'hysteria';
   const network = stream?.network || '';
 
   const showTcp = useMemo(

frontend/src/pages/xray/BasicsTab.tsx

@@ -3,7 +3,7 @@ import { useTranslation } from 'react-i18next';
 import { Alert, Button, Collapse, Input, Modal, Select, Space, Switch } from 'antd';
 import { CloudOutlined, ApiOutlined } from '@ant-design/icons';
 
-import { OutboundDomainStrategies } from '@/models/outbound';
+import { OutboundDomainStrategies } from '@/schemas/primitives';
 import SettingListItem from '@/components/SettingListItem';
 import type { XraySettingsValue, SetTemplate } from '@/hooks/useXraySetting';
 import './BasicsTab.css';
@@ -217,7 +217,7 @@ export default function BasicsTab({
               <Select
                 value={freedomStrategy}
                 style={{ width: '100%' }}
-                options={(OutboundDomainStrategies as string[]).map((s) => ({ value: s, label: s }))}
+                options={OutboundDomainStrategies.map((s) => ({ value: s, label: s }))}
                 onChange={(next) => mutate((tt) => {
                   if (!tt.outbounds) tt.outbounds = [];
                   const idx = tt.outbounds.findIndex((o) => o?.protocol === 'freedom' && o?.tag === 'direct');

frontend/src/pages/xray/OutboundsTab.tsx

@@ -34,7 +34,7 @@ import {
 import type { ColumnsType } from 'antd/es/table';
 
 import { SizeFormatter } from '@/utils';
-import { Protocols } from '@/models/outbound';
+import { OutboundProtocols as Protocols } from '@/schemas/primitives';
 import OutboundFormModal from './OutboundFormModal';
 import type { XraySettingsValue, SetTemplate, OutboundTestState, OutboundTrafficRow } from '@/hooks/useXraySetting';
 import './OutboundsTab.css';

frontend/src/schemas/primitives/index.ts

@@ -1,4 +1,5 @@
 export * from './port';
 export * from './protocol';
+export * from './outbound-protocol';
 export * from './sniffing';
 export * from './flow';

frontend/src/schemas/primitives/outbound-protocol.ts

@@ -0,0 +1,30 @@
+export const OutboundProtocols = Object.freeze({
+  Freedom: 'freedom',
+  Blackhole: 'blackhole',
+  DNS: 'dns',
+  VMess: 'vmess',
+  VLESS: 'vless',
+  Trojan: 'trojan',
+  Shadowsocks: 'shadowsocks',
+  Wireguard: 'wireguard',
+  Hysteria: 'hysteria',
+  Socks: 'socks',
+  HTTP: 'http',
+  Loopback: 'loopback',
+});
+
+export const OutboundDomainStrategies = Object.freeze([
+  'AsIs',
+  'UseIP',
+  'UseIPv4',
+  'UseIPv6',
+  'UseIPv6v4',
+  'UseIPv4v6',
+  'ForceIP',
+  'ForceIPv6v4',
+  'ForceIPv6',
+  'ForceIPv4v6',
+  'ForceIPv4',
+] as const);
+
+export type OutboundDomainStrategy = (typeof OutboundDomainStrategies)[number];