feat: add on-demand format conversion support (FBX, STL, USDZ, MP4, GIF)

- Discover /creations/resourceConvert endpoint via browser inspection
- Add resource_convert() method to api.py and api_complete.py
- Extend MODEL_FORMAT_KEYS with fbx, stl, usdz, mp4, gif
- Update get_model_urls() and download_model() with include_converted flag
- Update CLI with --converted flag for formats and download commands
- Update reverse engineering docs with native vs converted format tables

hunyuan3dweb/cli.py

@@ -33,6 +33,8 @@ def main():
 
     formats_parser = subparsers.add_parser("formats", help="列出创作可用下载格式")
     formats_parser.add_argument("creation_id", help="创作ID")
+    formats_parser.add_argument("--converted", action="store_true",
+                                help="包含转换格式 (fbx/stl/usdz/mp4/gif)")
     formats_parser.add_argument("--cookies", "-c", default=_DEFAULT_COOKIE, help="Cookie文件路径")
 
     download_parser = subparsers.add_parser("download", help="下载指定格式模型")
@@ -41,6 +43,8 @@ def main():
                                  help="格式键名 (默认: glb)")
     download_parser.add_argument("--output", "-o", default=None,
                                  help="本地保存路径 (默认自动推断)")
+    download_parser.add_argument("--converted", action="store_true",
+                                 help="若格式为转换格式，自动调用转换接口")
     download_parser.add_argument("--cookies", "-c", default=_DEFAULT_COOKIE, help="Cookie文件路径")
 
     args = parser.parse_args()
@@ -62,14 +66,15 @@ def main():
     elif args.command == "status":
         print(json.dumps(api.get_generation_status(args.creation_id), indent=2, ensure_ascii=False))
     elif args.command == "formats":
-        urls = api.get_model_urls(args.creation_id)
+        urls = api.get_model_urls(args.creation_id, include_converted=args.converted)
         if not urls:
             print("暂无可用格式，可能生成未完成或失败。", file=sys.stderr)
             sys.exit(1)
         for key, url in urls.items():
             print(f"{key}: {url}")
     elif args.command == "download":
-        path = api.download_model(args.creation_id, args.format, args.output)
+        path = api.download_model(args.creation_id, args.format, args.output,
+                                  include_converted=args.converted)
         print(f"已下载: {path}")