feat(核算)!: 添加 T+ 正式核算与采集托管

补齐源快照、资料预演、正式导入及工资核算的依赖链路。
新增版本化输入、逐段 FIFO、生成锁和结构化当月调整，
并提供默认关闭的周期采集、有限重试及 Windows 托管。

原始客户资料、私有配置及首页改动不纳入本次提交。

BREAKING CHANGE: 升级前需应用新增迁移，并通过
PAYROLL_MAKER_USER_ID 绑定实际工资制作人，否则业务只读。
旧单批次核算默认关闭；历史兼容需显式启用
PAYROLL_ALLOW_LEGACY_CALCULATION。生产启用和真实金额待验收。

backend/app/models/__init__.py

@@ -17,6 +17,7 @@ from app.models.customer import Customer, OwnershipChangeLog
 from app.models.login_log import LoginLog
 from app.models.operation_log import OperationLog
 from app.models.param import ParamChangeBatch, ParamDefinition, ParamValue
+from app.models.payroll import PayrollAllocation, PayrollInput, PayrollMonth
 from app.models.performance_ledger import PerformanceLedger
 from app.models.personnel import Personnel, PersonnelPlan, PersonnelRegion
 from app.models.product import Product
@@ -26,12 +27,20 @@ from app.models.role import Permission, Role, RolePermission
 from app.models.settlement import AdjustmentOrder, MonthlySettlement, SettlementItem
 from app.models.shipment import Shipment, ShipmentItem
 from app.models.system_setting import SystemSetting
+from app.models.tplus_automation import TPlusAutomationState
 from app.models.tplus_sync import (
     TPlusSyncBatch,
     TPlusSyncError,
     TPlusSyncRecord,
     TPlusSyncWatermark,
 )
+from app.models.tplus_workbench import (
+    TPlusFact,
+    TPlusSourceHead,
+    TPlusSourceLink,
+    TPlusWorkLine,
+    TPlusWorkRun,
+)
 from app.models.user import User, UserRole
 
 __all__ = [
@@ -52,6 +61,9 @@ __all__ = [
     "ParamChangeBatch",
     "ParamDefinition",
     "ParamValue",
+    "PayrollAllocation",
+    "PayrollInput",
+    "PayrollMonth",
     "PerformanceLedger",
     "Permission",
     "Personnel",
@@ -66,10 +78,16 @@ __all__ = [
     "Shipment",
     "ShipmentItem",
     "SystemSetting",
+    "TPlusAutomationState",
+    "TPlusFact",
+    "TPlusSourceHead",
+    "TPlusSourceLink",
     "TPlusSyncBatch",
     "TPlusSyncError",
     "TPlusSyncRecord",
     "TPlusSyncWatermark",
+    "TPlusWorkLine",
+    "TPlusWorkRun",
     "TimestampMixin",
     "User",
     "UserRole",