fix(proxy): 修正获取代理地址时的字典访问方式

- 将 account_list[account_name].address 修改为 account_list[account_name].get("address")
- 防止访问属性时出现异常，增强代码健壮性
- 优化代理地址获取逻辑，提高兼容性

src/service/proxy.py

@@ -39,7 +39,7 @@ class ProxyService:
     def get_proxy(self, account_name: str):
         self.set_expire_strategy()
         if account_name in account_list:
-            return account_list[account_name].address
+            return account_list[account_name].get("address")
         return self.set_proxy(account_name)
 
     def set_proxy(self, account_name: str):