Implement proper architecture: module->chain->API with single CategoryHelper

Co-authored-by: jxxghp <51039935+jxxghp@users.noreply.github.com>

app/api/endpoints/category.py

@@ -1,8 +1,8 @@
 from fastapi import APIRouter, Depends
 from app import schemas
+from app.chain.tmdb import TmdbChain
 from app.db.models import User
 from app.db.user_oper import get_current_active_superuser, get_current_active_user
-from app.helper.category import CategoryHelper
 from app.schemas.category import CategoryConfig
 
 router = APIRouter()
@@ -13,7 +13,7 @@ def get_category_config(_: User = Depends(get_current_active_user)):
     """
     获取分类策略配置
     """
-    config = CategoryHelper().load()
+    config = TmdbChain().load_category_config()
     return schemas.Response(success=True, data=config.model_dump())
 
 
@@ -22,7 +22,7 @@ def save_category_config(config: CategoryConfig, _: User = Depends(get_current_a
     """
     保存分类策略配置
     """
-    if CategoryHelper().save(config):
+    if TmdbChain().save_category_config(config):
         return schemas.Response(success=True, message="保存成功")
     else:
         return schemas.Response(success=False, message="保存失败")