feat(xhttp): support sessionID* rename + sessionIDTable/Length (xray v26.6.22) (#5506)

* feat(xhttp): support sessionID* rename + sessionIDTable/Length (xray v26.6.22)

xray-core v26.6.22 (PR #6258) renamed the XHTTP session config keys
sessionPlacement/sessionKey to sessionIDPlacement/sessionIDKey (no fallback
kept in core) and added sessionIDTable (predefined charset name or literal
ASCII) and sessionIDLength (range, e.g. 16-32, lower bound > 0).

Panel changes:
- Schema (xhttp.ts): rename the two keys, add sessionIDTable/sessionIDLength,
  and a z.preprocess that lifts legacy keys off stored configs so an upgraded
  panel never silently drops a saved session setting.
- Wire normalize + share-link build/parse: rename keys, emit the two new
  fields, and accept legacy sessionPlacement/sessionKey from old share links.
- Inbound + outbound XHTTP forms: rename field paths, add a sessionIDTable
  autocomplete (9 predefined tables + free ASCII) and a sessionIDLength range
  input shown only when a table is set, with light client validation (ASCII
  table, length min > 0; xray enforces the room-size minimum server-side).
- Subscription (service.go) and Clash (clash_service.go) builders: emit the
  renamed + new keys, with a legacy fallback for not-yet-resaved inbounds.
- Locales: add sessionIDTable/sessionIDLength labels + hints in all 13 files.

Two sibling v26.6.22 XHTTP commits need no panel change and are covered by the
core bump alone: #6332 (XHTTP/3 closes QUIC/UDP) and #6320 (udpHop honors the
existing dialerProxy).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* test(xhttp): add Session ID Table to inbound form-blocks snapshot

The new sessionIDTable input renders by default in the inbound XHTTP form, so
its label joins the field-structure snapshot. sessionIDLength stays conditional
(only shown when a table is set), so it does not appear here.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(xhttp): migrate legacy session keys in the running xray config

The Zod preprocess plus the subscription/Clash fallbacks only covered the
panel UI and share-link output. The config handed to the running xray-core
process is built from the raw stored streamSettings in GetXrayConfig, which
did not rewrite the renamed XHTTP session keys — so a pre-upgrade inbound (or
template outbound) stored with a non-default sessionPlacement was emitted
unchanged and dropped by xray-core v26.6.22, until the admin re-saved it.

Lift sessionPlacement/sessionKey onto sessionIDPlacement/sessionIDKey at
config-generation time, in the existing inbound stream-rewrite block (next to
the tls/reality/externalProxy handling) and across template outbounds. The
lift is idempotent and leaves unchanged configs byte-identical so the
hot-reload diff never sees a spurious change.

Also tighten validateSessionIDLength to reject an inverted range (e.g. 32-16)
in addition to the existing lower-bound > 0 check.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(xray): avoid summed-capacity allocation in mergeSubscriptionOutbounds

CodeQL go/allocation-size-overflow flagged the pre-sized make() whose
capacity was a sum of three slice lengths. Grow the slice via append on
a nil slice instead; same result, no overflow-prone capacity expression.

frontend/src/pages/xray/outbounds/transport/xhttp.tsx

@@ -1,8 +1,10 @@
 import { useTranslation } from 'react-i18next';
-import { Form, Input, InputNumber, Select, Switch, type FormInstance } from 'antd';
+import { AutoComplete, Form, Input, InputNumber, Select, Switch, type FormInstance } from 'antd';
 
 import { HeaderMapEditor } from '@/components/form';
+import { validateSessionIDLength, validateSessionIDTable } from '@/lib/xray/xhttp-session-id';
 import type { OutboundFormValues } from '@/schemas/forms/outbound-form';
+import { XHTTP_SESSION_ID_TABLES } from '@/schemas/protocols/stream/xhttp';
 
 import { MODE_OPTIONS } from '../outbound-form-constants';
 
@@ -145,7 +147,7 @@ export default function XhttpForm({ form, onXmuxToggle }: XhttpFormProps) {
           only matters when placement is not 'path'. */}
       <Form.Item
         label={t('pages.inbounds.form.sessionPlacement')}
-        name={['streamSettings', 'xhttpSettings', 'sessionPlacement']}
+        name={['streamSettings', 'xhttpSettings', 'sessionIDPlacement']}
       >
         <Select
           placeholder="Default (path)"
@@ -161,19 +163,49 @@ export default function XhttpForm({ form, onXmuxToggle }: XhttpFormProps) {
       <Form.Item shouldUpdate noStyle>
         {() => {
           const placement = form.getFieldValue([
-            'streamSettings', 'xhttpSettings', 'sessionPlacement',
+            'streamSettings', 'xhttpSettings', 'sessionIDPlacement',
           ]);
           if (!placement || placement === 'path') return null;
           return (
             <Form.Item
               label={t('pages.inbounds.form.sessionKey')}
-              name={['streamSettings', 'xhttpSettings', 'sessionKey']}
+              name={['streamSettings', 'xhttpSettings', 'sessionIDKey']}
             >
               <Input placeholder="x_session" />
             </Form.Item>
           );
         }}
       </Form.Item>
+      <Form.Item
+        label={t('pages.inbounds.form.sessionIDTable')}
+        tooltip={t('pages.inbounds.form.sessionIDTableHint')}
+        name={['streamSettings', 'xhttpSettings', 'sessionIDTable']}
+        rules={[{ validator: validateSessionIDTable }]}
+      >
+        <AutoComplete
+          allowClear
+          options={XHTTP_SESSION_ID_TABLES.map((v) => ({ value: v }))}
+          placeholder="Base62"
+        />
+      </Form.Item>
+      <Form.Item shouldUpdate noStyle>
+        {() => {
+          const table = form.getFieldValue([
+            'streamSettings', 'xhttpSettings', 'sessionIDTable',
+          ]);
+          if (!table) return null;
+          return (
+            <Form.Item
+              label={t('pages.inbounds.form.sessionIDLength')}
+              tooltip={t('pages.inbounds.form.sessionIDLengthHint')}
+              name={['streamSettings', 'xhttpSettings', 'sessionIDLength']}
+              rules={[{ validator: validateSessionIDLength }]}
+            >
+              <Input placeholder="8-16" />
+            </Form.Item>
+          );
+        }}
+      </Form.Item>
       <Form.Item
         label={t('pages.inbounds.form.sequencePlacement')}
         name={['streamSettings', 'xhttpSettings', 'seqPlacement']}