feat(openai-ws): 合并 WS v2 透传模式与前端 ws mode

新增 OpenAI WebSocket v2 passthrough relay 数据面与服务适配层，
支持按账号 ws mode 在 ctx_pool 与 passthrough 间路由。

同步调整前端 OpenAI ws mode 选项为 off/ctx_pool/passthrough，
并补充 i18n 文案与对应单测。

新增 Caddyfile.dmit 与 docker-compose-aicodex.yml 部署配置，
用于宿主机场景下的反向代理与服务编排。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/utils/__tests__/openaiWsMode.spec.ts

@@ -1,31 +1,34 @@
 import { describe, expect, it } from 'vitest'
 import {
-  OPENAI_WS_MODE_DEDICATED,
+  OPENAI_WS_MODE_CTX_POOL,
   OPENAI_WS_MODE_OFF,
-  OPENAI_WS_MODE_SHARED,
+  OPENAI_WS_MODE_PASSTHROUGH,
   isOpenAIWSModeEnabled,
   normalizeOpenAIWSMode,
   openAIWSModeFromEnabled,
+  resolveOpenAIWSModeConcurrencyHintKey,
   resolveOpenAIWSModeFromExtra
 } from '@/utils/openaiWsMode'
 
 describe('openaiWsMode utils', () => {
   it('normalizes mode values', () => {
     expect(normalizeOpenAIWSMode('off')).toBe(OPENAI_WS_MODE_OFF)
-    expect(normalizeOpenAIWSMode(' Shared ')).toBe(OPENAI_WS_MODE_SHARED)
-    expect(normalizeOpenAIWSMode('DEDICATED')).toBe(OPENAI_WS_MODE_DEDICATED)
+    expect(normalizeOpenAIWSMode('ctx_pool')).toBe(OPENAI_WS_MODE_CTX_POOL)
+    expect(normalizeOpenAIWSMode('passthrough')).toBe(OPENAI_WS_MODE_PASSTHROUGH)
+    expect(normalizeOpenAIWSMode(' Shared ')).toBe(OPENAI_WS_MODE_CTX_POOL)
+    expect(normalizeOpenAIWSMode('DEDICATED')).toBe(OPENAI_WS_MODE_CTX_POOL)
     expect(normalizeOpenAIWSMode('invalid')).toBeNull()
   })
 
   it('maps legacy enabled flag to mode', () => {
-    expect(openAIWSModeFromEnabled(true)).toBe(OPENAI_WS_MODE_SHARED)
+    expect(openAIWSModeFromEnabled(true)).toBe(OPENAI_WS_MODE_CTX_POOL)
     expect(openAIWSModeFromEnabled(false)).toBe(OPENAI_WS_MODE_OFF)
     expect(openAIWSModeFromEnabled('true')).toBeNull()
   })
 
   it('resolves by mode key first, then enabled, then fallback enabled keys', () => {
     const extra = {
-      openai_oauth_responses_websockets_v2_mode: 'dedicated',
+      openai_oauth_responses_websockets_v2_mode: 'passthrough',
       openai_oauth_responses_websockets_v2_enabled: false,
       responses_websockets_v2_enabled: false
     }
@@ -34,7 +37,7 @@ describe('openaiWsMode utils', () => {
       enabledKey: 'openai_oauth_responses_websockets_v2_enabled',
       fallbackEnabledKeys: ['responses_websockets_v2_enabled', 'openai_ws_enabled']
     })
-    expect(mode).toBe(OPENAI_WS_MODE_DEDICATED)
+    expect(mode).toBe(OPENAI_WS_MODE_PASSTHROUGH)
   })
 
   it('falls back to default when nothing is present', () => {
@@ -47,9 +50,21 @@ describe('openaiWsMode utils', () => {
     expect(mode).toBe(OPENAI_WS_MODE_OFF)
   })
 
-  it('treats off as disabled and shared/dedicated as enabled', () => {
+  it('treats off as disabled and non-off modes as enabled', () => {
     expect(isOpenAIWSModeEnabled(OPENAI_WS_MODE_OFF)).toBe(false)
-    expect(isOpenAIWSModeEnabled(OPENAI_WS_MODE_SHARED)).toBe(true)
-    expect(isOpenAIWSModeEnabled(OPENAI_WS_MODE_DEDICATED)).toBe(true)
+    expect(isOpenAIWSModeEnabled(OPENAI_WS_MODE_CTX_POOL)).toBe(true)
+    expect(isOpenAIWSModeEnabled(OPENAI_WS_MODE_PASSTHROUGH)).toBe(true)
+  })
+
+  it('resolves concurrency hint key by mode', () => {
+    expect(resolveOpenAIWSModeConcurrencyHintKey(OPENAI_WS_MODE_OFF)).toBe(
+      'admin.accounts.openai.wsModeConcurrencyHint'
+    )
+    expect(resolveOpenAIWSModeConcurrencyHintKey(OPENAI_WS_MODE_CTX_POOL)).toBe(
+      'admin.accounts.openai.wsModeConcurrencyHint'
+    )
+    expect(resolveOpenAIWSModeConcurrencyHintKey(OPENAI_WS_MODE_PASSTHROUGH)).toBe(
+      'admin.accounts.openai.wsModePassthroughHint'
+    )
   })
 })