Add balance check script for OpenRouter API

- Introduced a new Python script to check and display the balance of credits using the OpenRouter API.
- Implemented error handling for API requests and included informative print statements for total credits, total usage, and remaining balance.
- Added a placeholder for the API key to facilitate user customization.

余额查询.py

@@ -0,0 +1,36 @@
+import requests
+
+def check_openrouter_balance(api_key):
+    url = "https://openrouter.ai/api/v1/credits"
+    
+    headers = {
+        "Authorization": f"Bearer {api_key}",
+        "Referer": "https://your-site.com", 
+        "X-Title": "Balance Check Script"
+    }
+
+    try:
+        response = requests.get(url, headers=headers)
+        response.raise_for_status() # 检查请求是否成功
+        
+        data = response.json().get("data", {})
+        
+        total_credits = data.get("total_credits", 0) # 总充值/赠送金额
+        total_usage = data.get("total_usage", 0)     # 总消耗金额
+        
+        # 计算剩余余额
+        balance = total_credits - total_usage
+        
+        print(f"💰 总额度 (Total Credits): ${total_credits}")
+        print(f"📉 已使用 (Total Usage):   ${total_usage}")
+        print(f"💵 剩余余额 (Balance):     ${balance:.4f}")
+        
+        return balance
+
+    except requests.exceptions.RequestException as e:
+        print(f"查询失败: {e}")
+        return None
+
+# 替换你的 API Key
+MY_API_KEY = ""
+check_openrouter_balance(MY_API_KEY)