refactor(repo): 收敛 base_model 双轨，删除函数统一走 repo.batch_delete_r

- shared/base_repository.py 新增 batch_delete_r（返回 R，等价原 base_model 语义）
- 20 个模块删除函数从 Model.batch_delete_r 改为 x_repo.batch_delete_r
- shared/base_model.py 移除 classmethod（get_by_id/get_by_ids/get_all_active/exists/batch_delete_r），只留字段 + to_dict
- 清理 base_model 多余 imports
- 实测 dept 删除、批量删除及多模块读接口正常

Co-Authored-By: Claude <noreply@anthropic.com>

modules/cms/ad/service.py

@@ -150,7 +150,7 @@ def update_ad(request, data: AdForm):
 # 删除广告
 
 def delete_ad(ad_id):
-    return Ad.batch_delete_r(ad_id)
+    return ad_repo.batch_delete_r(ad_id)
 # 设置状态
 
 def update_ad_status(request, data: AdStatusForm):

modules/cms/ad_sort/service.py

@@ -115,7 +115,7 @@ def update_ad_sort(request, data: AdSortForm):
 # 删除广告位
 
 def delete_ad_sort(adsort_id):
-    return AdSort.batch_delete_r(adsort_id)
+    return adsort_repo.batch_delete_r(adsort_id)
 # 查询广告位列表
 
 def get_ad_sort_list():

modules/cms/item/service.py

@@ -129,7 +129,7 @@ def update_item(request, data: ItemForm):
 # 删除站点
 
 def delete_item(item_id):
-    return Item.batch_delete_r(item_id)
+    return item_repo.batch_delete_r(item_id)
 # 获取站点列表
 
 def get_item_list():

modules/cms/item_cate/service.py

@@ -145,7 +145,7 @@ def update_item_cate(request, data: ItemCateForm):
 # 删除栏目
 
 def delete_item_cate(cate_id):
-    return ItemCate.batch_delete_r(cate_id)
+    return itemcate_repo.batch_delete_r(cate_id)
 # 获取栏目列表
 
 def get_cate_list():