feat: support Responses to Chat (#5787)

* fix(openai): harden Chat-to-Responses compatibility

Add a shared Responses-to-Chat stream state machine and use it from the OpenAI relay path. Preserve assistant text alongside tool calls, bind tool argument deltas by output_index, map incomplete finish reasons, support reasoning/custom tool events, and buffer upstream SSE for non-stream Chat clients.

Add deterministic service tests and relay SSE tests for the conversion path.

Related to #5745.

* refactor: rename openaicompat to relayconvert for improved clarity

* feat(gemini): support responses request conversion

* feat: add responses to chat conversion support

* fix: harden responses chat conversion edge cases

web/default/src/features/channels/lib/advanced-custom.ts

@@ -43,6 +43,10 @@ export const ADVANCED_CUSTOM_CONVERTER_OPTIONS: Array<{
     value: 'openai_chat_completions_to_openai_responses',
     label: 'OpenAI Chat to OpenAI Responses',
   },
+  {
+    value: 'openai_responses_to_openai_chat_completions',
+    label: 'OpenAI Responses to OpenAI Chat',
+  },
   {
     value: 'gemini_generate_content_to_openai_chat_completions',
     label: 'Gemini Generate Content to OpenAI Chat',
@@ -326,6 +330,9 @@ export function getAdvancedCustomUpstreamPathPlaceholder(
   if (converter === 'openai_chat_completions_to_anthropic_messages') {
     return '/v1/messages'
   }
+  if (converter === 'openai_responses_to_openai_chat_completions') {
+    return '/v1/chat/completions'
+  }
   return '/v1/chat/completions'
 }
 
@@ -573,6 +580,9 @@ function isConverterPathAllowed(
   ) {
     return incomingPath === '/v1/chat/completions'
   }
+  if (converter === 'openai_responses_to_openai_chat_completions') {
+    return incomingPath === '/v1/responses'
+  }
   return (
     incomingPath.includes(':generateContent') ||
     incomingPath.includes(':streamGenerateContent')

web/default/src/features/channels/types.ts

@@ -131,6 +131,7 @@ export type AdvancedCustomConverter =
   | 'anthropic_messages_to_openai_chat_completions'
   | 'openai_chat_completions_to_anthropic_messages'
   | 'openai_chat_completions_to_openai_responses'
+  | 'openai_responses_to_openai_chat_completions'
   | 'gemini_generate_content_to_openai_chat_completions'
   | 'openai_chat_completions_to_gemini_generate_content'
 

web/default/src/i18n/locales/en.json

@@ -2995,6 +2995,7 @@
     "OpenAI Rerank": "OpenAI Rerank",
     "OpenAI Responses": "OpenAI Responses",
     "OpenAI Responses Compact": "OpenAI Responses Compact",
+    "OpenAI Responses to OpenAI Chat": "OpenAI Responses to OpenAI Chat",
     "OpenAI, Anthropic, etc.": "OpenAI, Anthropic, etc.",
     "OpenAI, Anthropic, Google, etc.": "OpenAI, Anthropic, Google, etc.",
     "OpenAIMax": "OpenAIMax",
@@ -3675,8 +3676,8 @@
     "Resetting...": "Resetting...",
     "Resolve Conflicts": "Resolve Conflicts",
     "Resource Configuration": "Resource Configuration",
-    "Responding...": "Responding...",
     "Resources": "Resources",
+    "Responding...": "Responding...",
     "Response": "Response",
     "Response Time": "Response Time",
     "Response time: {{duration}}": "Response time: {{duration}}",

web/default/src/i18n/locales/fr.json

@@ -2995,6 +2995,7 @@
     "OpenAI Rerank": "OpenAI Rerank",
     "OpenAI Responses": "OpenAI Responses",
     "OpenAI Responses Compact": "OpenAI Responses Compact",
+    "OpenAI Responses to OpenAI Chat": "OpenAI Responses vers OpenAI Chat",
     "OpenAI, Anthropic, etc.": "OpenAI, Anthropic, etc.",
     "OpenAI, Anthropic, Google, etc.": "OpenAI, Anthropic, Google, etc.",
     "OpenAIMax": "OpenAIMax",
@@ -3675,8 +3676,8 @@
     "Resetting...": "Réinitialisation...",
     "Resolve Conflicts": "Résoudre les conflits",
     "Resource Configuration": "Configuration des ressources",
-    "Responding...": "Réponse en cours...",
     "Resources": "Ressources",
+    "Responding...": "Réponse en cours...",
     "Response": "Réponse",
     "Response Time": "Temps de réponse",
     "Response time: {{duration}}": "Temps de réponse : {{duration}}",

web/default/src/i18n/locales/ja.json

@@ -2995,6 +2995,7 @@
     "OpenAI Rerank": "OpenAI 再ランク付け",
     "OpenAI Responses": "OpenAI レスポンス",
     "OpenAI Responses Compact": "OpenAI レスポンス圧縮",
+    "OpenAI Responses to OpenAI Chat": "OpenAI Responses から OpenAI Chat",
     "OpenAI, Anthropic, etc.": "OpenAI、Anthropicなど",
     "OpenAI, Anthropic, Google, etc.": "OpenAI、Anthropic、Googleなど",
     "OpenAIMax": "OpenAIMax",
@@ -3675,8 +3676,8 @@
     "Resetting...": "リセット中...",
     "Resolve Conflicts": "競合を解決",
     "Resource Configuration": "リソース設定",
-    "Responding...": "応答中...",
     "Resources": "リソース",
+    "Responding...": "応答中...",
     "Response": "レスポンス",
     "Response Time": "応答時間",
     "Response time: {{duration}}": "応答時間: {{duration}}",

web/default/src/i18n/locales/ru.json

@@ -2995,6 +2995,7 @@
     "OpenAI Rerank": "Реранжирование OpenAI",
     "OpenAI Responses": "Ответы OpenAI",
     "OpenAI Responses Compact": "Компактные ответы OpenAI",
+    "OpenAI Responses to OpenAI Chat": "OpenAI Responses в OpenAI Chat",
     "OpenAI, Anthropic, etc.": "OpenAI, Anthropic и т.д.",
     "OpenAI, Anthropic, Google, etc.": "OpenAI, Anthropic, Google и т.д.",
     "OpenAIMax": "OpenAIMax",
@@ -3675,8 +3676,8 @@
     "Resetting...": "Сброс...",
     "Resolve Conflicts": "Разрешить конфликты",
     "Resource Configuration": "Конфигурация ресурсов",
-    "Responding...": "Отвечаем...",
     "Resources": "Ресурсы",
+    "Responding...": "Отвечаем...",
     "Response": "Ответ",
     "Response Time": "Время ответа",
     "Response time: {{duration}}": "Время ответа: {{duration}}",

web/default/src/i18n/locales/vi.json

@@ -2995,6 +2995,7 @@
     "OpenAI Rerank": "OpenAI Rerank",
     "OpenAI Responses": "OpenAI Responses",
     "OpenAI Responses Compact": "OpenAI Responses Compact",
+    "OpenAI Responses to OpenAI Chat": "OpenAI Responses sang OpenAI Chat",
     "OpenAI, Anthropic, etc.": "OpenAI, Anthropic, v.v.",
     "OpenAI, Anthropic, Google, etc.": "OpenAI, Anthropic, Google, v.v.",
     "OpenAIMax": "OpenAIMax",
@@ -3675,8 +3676,8 @@
     "Resetting...": "Đang đặt lại...",
     "Resolve Conflicts": "Giải quyết Xung đột",
     "Resource Configuration": "Cấu hình tài nguyên",
-    "Responding...": "Đang phản hồi...",
     "Resources": "Tài nguyên",
+    "Responding...": "Đang phản hồi...",
     "Response": "Phản hồi",
     "Response Time": "Thời gian phản hồi",
     "Response time: {{duration}}": "Thời gian phản hồi: {{duration}}",

web/default/src/i18n/locales/zh.json

@@ -2995,6 +2995,7 @@
     "OpenAI Rerank": "OpenAI 重排序",
     "OpenAI Responses": "OpenAI 响应",
     "OpenAI Responses Compact": "OpenAI 响应压缩",
+    "OpenAI Responses to OpenAI Chat": "OpenAI Responses 到 OpenAI Chat",
     "OpenAI, Anthropic, etc.": "OpenAI、Anthropic 等",
     "OpenAI, Anthropic, Google, etc.": "OpenAI、Anthropic、Google 等",
     "OpenAIMax": "OpenAIMax",
@@ -3675,8 +3676,8 @@
     "Resetting...": "重置中...",
     "Resolve Conflicts": "解决冲突",
     "Resource Configuration": "资源配置",
-    "Responding...": "正在回复...",
     "Resources": "资源",
+    "Responding...": "正在回复...",
     "Response": "响应",
     "Response Time": "响应时间",
     "Response time: {{duration}}": "响应时间：{{duration}}",