feat: add xai video model

api/.env.example

@@ -61,6 +61,7 @@ YTDLP_COOKIES_FILE=
 YTDLP_COOKIES_FROM_BROWSER=
 VIDEO_MODEL=seedance
 VIDEO_MODEL_SEEDANCE=seedance-2-fast
+VIDEO_MODEL_XAI=grok-imagine-video
 VIDEO_MODEL_KLING=kling-omni
 VIDEO_MODEL_VEO3=veo-3.1-fast
 
@@ -96,6 +97,13 @@ POE_API_KEY=
 # VIDEO_STATUS_PATH=/api/v3/contents/generations/tasks/{id}
 # VIDEO_CONTENT_PATH=/api/v3/contents/generations/tasks/{id}/content
 #
+# SKG xAI/Grok Imagine 视频网关。真实 key 只填本地/服务器私有 .env。
+XAI_VIDEO_API_BASE_URL=https://ai.skg.com/ezlink/xai
+XAI_VIDEO_API_KEY=
+XAI_VIDEO_CREATE_PATH=/v1/videos/generations
+XAI_VIDEO_STATUS_PATH=/v1/videos/{id}
+XAI_VIDEO_CONTENT_PATH=
+#
 # 自定义视频网关覆盖；留空时如配置 POE_API_KEY，则走 Poe。
 VIDEO_API_BASE_URL=
 VIDEO_API_KEY=