refactor: centralize MoviePilot server helper

app/api/endpoints/plugin.py

@@ -21,6 +21,7 @@ from app.db.user_oper import (
     get_current_active_superuser_async,
 )
 from app.factory import app
+from app.helper.server import MoviePilotServerHelper
 from app.helper.plugin import PluginHelper
 from app.log import logger
 from app.scheduler import Scheduler
@@ -217,7 +218,7 @@ async def statistic(_: schemas.TokenPayload = Depends(verify_token)) -> Any:
     """
     插件安装统计
     """
-    return await PluginHelper().async_get_statistic()
+    return await MoviePilotServerHelper.async_get_plugin_statistic()
 
 
 @router.get(
@@ -257,7 +258,7 @@ async def install(
             )
             if compatible_message:
                 return schemas.Response(success=False, message=compatible_message)
-        await plugin_helper.async_install_reg(pid=plugin_id, repo_url=repo_url)
+        await MoviePilotServerHelper.async_install_plugin_reg(plugin_id=plugin_id, repo_url=repo_url)
     else:
         # 插件不存在或需要强制安装，下载安装并注册插件
         if repo_url:
@@ -267,6 +268,7 @@ async def install(
             # 安装失败则直接响应
             if not state:
                 return schemas.Response(success=False, message=msg)
+            await MoviePilotServerHelper.async_install_plugin_reg(plugin_id=plugin_id, repo_url=repo_url)
         else:
             # repo_url 为空时，也直接响应
             return schemas.Response(