feat(T+): 完成数据贯通与自动接入闭环

打通 T+ 快照、业务、发货、回款和核算准备链路，保留来源差异并提供待补状态。
新增业务自动接入任务、跨平台读取服务托管、权限复核、来源关联和前端核对页面。
补充迁移、隔离集成测试、浏览器模拟验收及角色授权边界修复。

backend/app/api/v1/base/customers.py

@@ -15,7 +15,8 @@ from fastapi import APIRouter, Depends, Path, Query
 
 from app.api.deps import DbSession, PayrollWriter, RequestMetaDep, get_current_user
 from app.core.response import ApiResponse, PageQuery, PageResult, ok
-from app.models import User
+from app.models import Customer, User
+from app.schemas.category_batch import CustomerCategoryBatch, CustomerOwnershipBatch
 from app.schemas.customer import (
     CustomerCreateIn,
     CustomerOut,
@@ -33,6 +34,18 @@ router = APIRouter(prefix="/customers", tags=["客户管理"])
 CurrentUser = Annotated[User, Depends(get_current_user)]
 
 
+@router.put("/batch-category")
+def batch_category(payload: CustomerCategoryBatch, session: DbSession, actor: PayrollWriter, meta: RequestMetaDep):
+    from app.services.category_batch import fill_missing
+
+    return ok(fill_missing(session, Customer, payload, actor, meta))
+
+
+@router.put("/batch-ownership")
+def batch_ownership(payload: CustomerOwnershipBatch, session: DbSession, actor: PayrollWriter, meta: RequestMetaDep):
+    return ok(customer_service.batch_change_ownership(session, payload, operator=actor, meta=meta))
+
+
 @router.get("", response_model=ApiResponse[PageResult[CustomerOut]], summary="客户列表")
 def list_customers(
     session: DbSession,

backend/app/api/v1/base/products.py

@@ -16,7 +16,8 @@ from fastapi import APIRouter, Depends, Path, Query
 
 from app.api.deps import DbSession, PayrollWriter, RequestMetaDep, get_current_user
 from app.core.response import ApiResponse, PageResult, ok
-from app.models import User
+from app.models import Product, User
+from app.schemas.category_batch import ProductCategoryBatch
 from app.schemas.product import (
     ProductCreateIn,
     ProductExtractIn,
@@ -32,6 +33,13 @@ CurrentUser = Annotated[User, Depends(get_current_user)]
 router = APIRouter(prefix="/products", tags=["产品管理"])
 
 
+@router.put("/batch-category")
+def batch_category(payload: ProductCategoryBatch, session: DbSession, actor: PayrollWriter, meta: RequestMetaDep):
+    from app.services.category_batch import fill_missing
+
+    return ok(fill_missing(session, Product, payload, actor, meta))
+
+
 @router.get("/extract/candidates")
 def extraction_candidates(session: DbSession, _: CurrentUser, keyword: str = "", page_num: int = Query(1, ge=1), page_size: int = Query(20, ge=1, le=100)):
     from app.services.product_completion import candidates