Add Chat Completions routing for Codex providers

- Add a Codex API format selector and routing badge for Chat Completions providers.
- Convert Codex Responses requests to upstream Chat Completions when routing is required.
- Convert Chat Completions JSON and SSE responses back to Responses format.
- Keep generated Codex wire_api values on Responses for Codex compatibility.
- Add i18n labels, provider metadata handling, and focused conversion tests.

src/i18n/locales/en.json

@@ -178,6 +178,7 @@
     "noRoutingSupport": "No Routing Support"
   },
   "codex": {
+    "needsRouting": "Needs Routing",
     "noRoutingSupport": "No Routing Support"
   },
   "claudeDesktop": {
@@ -908,6 +909,9 @@
     "apiFormatOpenAIChat": "OpenAI Chat Completions (Requires routing)",
     "apiFormatOpenAIResponses": "OpenAI Responses API (Requires routing)",
     "apiFormatGeminiNative": "Gemini Native generateContent (Requires routing)",
+    "codexApiFormatResponses": "OpenAI Responses API (Native)",
+    "codexApiFormatOpenAIChat": "OpenAI Chat Completions (Requires routing)",
+    "codexApiFormatHint": "Select the Codex API format actually supported by this provider; the config stays on Responses for newer Codex versions, while Chat Completions is converted through local routing.",
     "authField": "Auth Field",
     "authFieldAuthToken": "ANTHROPIC_AUTH_TOKEN (Default)",
     "authFieldApiKey": "ANTHROPIC_API_KEY",

src/i18n/locales/ja.json

@@ -178,6 +178,7 @@
     "noRoutingSupport": "ルーティング非対応"
   },
   "codex": {
+    "needsRouting": "ルーティングが必要",
     "noRoutingSupport": "ルーティング非対応"
   },
   "claudeDesktop": {
@@ -908,6 +909,9 @@
     "apiFormatOpenAIChat": "OpenAI Chat Completions（ルーティングが必要）",
     "apiFormatOpenAIResponses": "OpenAI Responses API（ルーティングが必要）",
     "apiFormatGeminiNative": "Gemini Native generateContent（ルーティングが必要）",
+    "codexApiFormatResponses": "OpenAI Responses API（ネイティブ）",
+    "codexApiFormatOpenAIChat": "OpenAI Chat Completions（ルーティングが必要）",
+    "codexApiFormatHint": "このプロバイダーが実際に対応している Codex API フォーマットを選択します。新しい Codex との互換性のため設定は Responses のままにし、Chat Completions はローカルルーティングで変換します。",
     "authField": "認証フィールド",
     "authFieldAuthToken": "ANTHROPIC_AUTH_TOKEN（デフォルト）",
     "authFieldApiKey": "ANTHROPIC_API_KEY",

src/i18n/locales/zh.json

@@ -178,6 +178,7 @@
     "noRoutingSupport": "不支持路由"
   },
   "codex": {
+    "needsRouting": "需要路由",
     "noRoutingSupport": "不支持路由"
   },
   "claudeDesktop": {
@@ -908,6 +909,9 @@
     "apiFormatOpenAIChat": "OpenAI Chat Completions (需开启路由)",
     "apiFormatOpenAIResponses": "OpenAI Responses API (需开启路由)",
     "apiFormatGeminiNative": "Gemini Native generateContent (需开启路由)",
+    "codexApiFormatResponses": "OpenAI Responses API (原生)",
+    "codexApiFormatOpenAIChat": "OpenAI Chat Completions (需开启路由)",
+    "codexApiFormatHint": "选择供应商真实支持的 Codex API 格式；配置仍保持 Responses 以兼容新版 Codex，Chat Completions 会通过本地路由自动转换。",
     "authField": "认证字段",
     "authFieldAuthToken": "ANTHROPIC_AUTH_TOKEN（默认）",
     "authFieldApiKey": "ANTHROPIC_API_KEY",