add first commit

doubao/global_var.py

@@ -0,0 +1,17 @@
+from typing import Optional
+from volcenginesdkarkruntime import AsyncArk
+
+_ark_client: Optional[AsyncArk] = None
+
+def set_ark_client(client: AsyncArk):
+    global _ark_client
+    _ark_client = client
+
+def get_ark_client() -> Optional[AsyncArk]:
+    return _ark_client
+
+def cleanup_ark_client():
+    global _ark_client
+    if _ark_client:
+        # AsyncArk 无显式 close，但可设为 None
+        _ark_client = None