feat(!usage): 支持查看账户额度剩余

pkg/utils/credit.py

@@ -0,0 +1,13 @@
+# OpenAI账号免费额度剩余查询
+import requests
+
+
+def fetch_credit_data(api_key: str) -> dict:
+    """OpenAI账号免费额度剩余查询"""
+    resp = requests.get(
+        url="https://api.openai.com/dashboard/billing/credit_grants",
+        headers={
+            "Authorization": "Bearer {}".format(api_key),
+        }
+    )
+    return resp.json()