feat: 为openai分组增加messages调度开关和默认映射模型

frontend/src/i18n/locales/en.ts

@@ -1443,6 +1443,14 @@ export default {
         fallbackHint: 'Non-Claude Code requests will use this group. Leave empty to reject directly.',
         noFallback: 'No Fallback (Reject)'
       },
+      openaiMessages: {
+        title: 'OpenAI Messages Dispatch',
+        allowDispatch: 'Allow /v1/messages dispatch',
+        allowDispatchHint: 'When enabled, API keys in this OpenAI group can dispatch requests through /v1/messages endpoint',
+        defaultModel: 'Default mapped model',
+        defaultModelPlaceholder: 'e.g., gpt-4.1',
+        defaultModelHint: 'When account has no model mapping configured, all request models will be mapped to this model'
+      },
       invalidRequestFallback: {
         title: 'Invalid Request Fallback Group',
         hint: 'Triggered only when upstream explicitly returns prompt too long. Leave empty to disable fallback.',

frontend/src/i18n/locales/zh.ts

@@ -1530,6 +1530,14 @@ export default {
         fallbackHint: '非 Claude Code 请求将使用此分组，留空则直接拒绝',
         noFallback: '不降级（直接拒绝）'
       },
+      openaiMessages: {
+        title: 'OpenAI Messages 调度配置',
+        allowDispatch: '允许 /v1/messages 调度',
+        allowDispatchHint: '启用后，此 OpenAI 分组的 API Key 可以通过 /v1/messages 端点调度请求',
+        defaultModel: '默认映射模型',
+        defaultModelPlaceholder: '例如: gpt-4.1',
+        defaultModelHint: '当账号未配置模型映射时，所有请求模型将映射到此模型'
+      },
       invalidRequestFallback: {
         title: '无效请求兜底分组',
         hint: '仅当上游明确返回 prompt too long 时才会触发，留空表示不兜底',