feat: use OpenAI Sora for long videos

.project.json

@@ -4,7 +4,7 @@
     {
       "env" : "OPENAI_API_KEY",
       "name" : "OPENAI_API_KEY",
-      "note" : "GPT 文本\/结构化\/图片生成；没填则图片 mock"
+      "note" : "GPT 文本\/结构化\/图片生成 + OpenAI Sora 视频；没填则图片 mock、视频不可用"
     },
     {
       "env" : "SEEDANCE_API_KEY",
@@ -37,7 +37,7 @@
     "username" : "kangwan"
   },
   "stack" : [
-    "Next.js + GPT + Seedance",
+    "Next.js + GPT + OpenAI Sora",
     "Docker Compose local\/prod parity",
     "Coolify Traefik"
   ],