fix: 修正代理数据提取逻辑以使用字典格式

DB.py

@@ -109,14 +109,12 @@ class DBVidcon:
         self.cursor.execute(sql)
         rows = self.cursor.fetchall()
         result = {row['rn']: row['parameter'] for row in rows}
-        self.close()
         return result
 
     def get_proxy_parameter(self, rn: str) -> str:
         sql = "SELECT parameter FROM proxy_agent WHERE rn = %s LIMIT 1"
         self.cursor.execute(sql, (rn,))
         result = self.cursor.fetchone()
-        self.close()
         return result[0] if result else None
 
     def rollback_records(self, raws):