fix(openapi): 补回图片异步响应契约

为 Images 生成与编辑接口重新声明 X-Async 参数和 202 TaskAcceptedResponse，保持 OpenAPI 与真实运行时行为一致。

已重新生成 Swagger，并通过 HTTP API 测试和桌面端生成客户端类型检查验证。

apps/api/docs/swagger.yaml

@@ -7400,6 +7400,7 @@ paths:
     post:
       consumes:
       - application/json
+      description: 默认同步返回 OpenAI-compatible Images 响应；设置 X-Async=true 时异步创建任务并返回 202。
       parameters:
       - description: OpenAI Images 请求
         in: body
@@ -7407,6 +7408,10 @@ paths:
         required: true
         schema:
           $ref: '#/definitions/httpapi.TaskRequest'
+      - description: true 时异步创建任务并返回 202
+        in: header
+        name: X-Async
+        type: boolean
       produces:
       - application/json
       responses:
@@ -7414,6 +7419,10 @@ paths:
           description: OK
           schema:
             $ref: '#/definitions/httpapi.CompatibleResponse'
+        "202":
+          description: Accepted
+          schema:
+            $ref: '#/definitions/httpapi.TaskAcceptedResponse'
         "400":
           description: Bad Request
           schema:
@@ -7439,6 +7448,7 @@ paths:
     post:
       consumes:
       - application/json
+      description: 默认同步返回 OpenAI-compatible Images 响应；设置 X-Async=true 时异步创建任务并返回 202。
       parameters:
       - description: OpenAI Images 请求
         in: body
@@ -7446,6 +7456,10 @@ paths:
         required: true
         schema:
           $ref: '#/definitions/httpapi.TaskRequest'
+      - description: true 时异步创建任务并返回 202
+        in: header
+        name: X-Async
+        type: boolean
       produces:
       - application/json
       responses:
@@ -7453,6 +7467,10 @@ paths:
           description: OK
           schema:
             $ref: '#/definitions/httpapi.CompatibleResponse'
+        "202":
+          description: Accepted
+          schema:
+            $ref: '#/definitions/httpapi.TaskAcceptedResponse'
         "400":
           description: Bad Request
           schema: