feat(module): add ServiceBaseHelper for service and instance

app/helper/downloader.py

@@ -1,5 +1,16 @@
-class DownloaderHelper:
+from app.helper.servicebase import ServiceBaseHelper
+from app.schemas import DownloaderConf
+from app.schemas.types import SystemConfigKey
+
+
+class DownloaderHelper(ServiceBaseHelper[DownloaderConf]):
     """
     下载器帮助类
     """
-    pass
+
+    def __init__(self):
+        super().__init__(
+            config_key=SystemConfigKey.Downloaders,
+            conf_type=DownloaderConf,
+            modules=["QbittorrentModule", "TransmissionModule"]
+        )