feat(codex-image): 封装 GPT Image 2 图片接口并收紧错误处理

- 新增 openai:image 路由、planner 与 finalize，内部通过 Codex responses image_generation tool 执行生图

- 补充 Codex OAuth/header 兼容、图片 success report 本地处理与相关前后端/集成测试

- 禁止 chat/completions 使用 gpt-image-2，图片接口限制 n=1，并移除 Provider 模型页的图片能力开关

frontend/src/api/endpoints/types/api-format.ts

@@ -6,6 +6,7 @@ export const API_FORMATS = {
   OPENAI: 'openai:chat',
   OPENAI_CLI: 'openai:cli',
   OPENAI_COMPACT: 'openai:compact',
+  OPENAI_IMAGE: 'openai:image',
   OPENAI_VIDEO: 'openai:video',
   GEMINI: 'gemini:chat',
   GEMINI_CLI: 'gemini:cli',
@@ -21,6 +22,7 @@ export const API_FORMAT_LABELS: Record<string, string> = {
   [API_FORMATS.OPENAI]: 'OpenAI Chat',
   [API_FORMATS.OPENAI_CLI]: 'OpenAI CLI',
   [API_FORMATS.OPENAI_COMPACT]: 'OpenAI Compact',
+  [API_FORMATS.OPENAI_IMAGE]: 'OpenAI Image',
   [API_FORMATS.OPENAI_VIDEO]: 'OpenAI Video',
   [API_FORMATS.GEMINI]: 'Gemini Chat',
   [API_FORMATS.GEMINI_CLI]: 'Gemini CLI',
@@ -31,6 +33,7 @@ export const API_FORMAT_LABELS: Record<string, string> = {
   OPENAI: 'OpenAI Chat',
   OPENAI_CLI: 'OpenAI CLI',
   OPENAI_COMPACT: 'OpenAI Compact',
+  OPENAI_IMAGE: 'OpenAI Image',
   OPENAI_VIDEO: 'OpenAI Video',
   GEMINI: 'Gemini Chat',
   GEMINI_CLI: 'Gemini CLI',
@@ -42,6 +45,7 @@ export const API_FORMAT_SHORT: Record<string, string> = {
   [API_FORMATS.OPENAI]: 'O',
   [API_FORMATS.OPENAI_CLI]: 'OC',
   [API_FORMATS.OPENAI_COMPACT]: 'OCP',
+  [API_FORMATS.OPENAI_IMAGE]: 'OI',
   [API_FORMATS.OPENAI_VIDEO]: 'OV',
   [API_FORMATS.CLAUDE]: 'C',
   [API_FORMATS.CLAUDE_CLI]: 'CC',
@@ -52,6 +56,7 @@ export const API_FORMAT_SHORT: Record<string, string> = {
   OPENAI: 'O',
   OPENAI_CLI: 'OC',
   OPENAI_COMPACT: 'OCP',
+  OPENAI_IMAGE: 'OI',
   OPENAI_VIDEO: 'OV',
   CLAUDE: 'C',
   CLAUDE_CLI: 'CC',
@@ -65,6 +70,7 @@ export const API_FORMAT_ORDER: string[] = [
   API_FORMATS.OPENAI,
   API_FORMATS.OPENAI_CLI,
   API_FORMATS.OPENAI_COMPACT,
+  API_FORMATS.OPENAI_IMAGE,
   API_FORMATS.OPENAI_VIDEO,
   API_FORMATS.CLAUDE,
   API_FORMATS.CLAUDE_CLI,
@@ -85,6 +91,7 @@ export const API_FORMAT_KIND_LABELS: Record<string, string> = {
   chat: 'Chat',
   cli: 'CLI',
   compact: 'Compact',
+  image: 'Image',
   video: 'Video',
 }
 

frontend/src/features/providers/components/provider-tabs/ModelsTab.vue

@@ -209,6 +209,7 @@
         请前往"模型目录"页面添加模型
       </p>
     </div>
+
   </Card>
 
   <ModelTestDialog

frontend/src/mocks/data.ts

@@ -878,6 +878,7 @@ export const MOCK_API_FORMATS = {
     { value: 'claude:cli', label: 'Claude CLI', default_path: '/v1/messages', aliases: [] },
     { value: 'openai:chat', label: 'OpenAI Chat', default_path: '/v1/chat/completions', aliases: [] },
     { value: 'openai:cli', label: 'OpenAI CLI', default_path: '/v1/responses', aliases: [] },
+    { value: 'openai:image', label: 'OpenAI Image', default_path: '/v1/images/generations', aliases: [] },
     { value: 'openai:video', label: 'OpenAI Video', default_path: '/v1/videos', aliases: [] },
     { value: 'gemini:chat', label: 'Gemini Chat', default_path: '/v1beta/models/{model}:{action}', aliases: [] },
     { value: 'gemini:cli', label: 'Gemini CLI', default_path: '/v1beta/models/{model}:{action}', aliases: [] },