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/schemas/tplus.py

@@ -77,6 +77,8 @@ class TPlusBatchOut(BaseModel):
     finished_at: datetime | None
     can_retry: bool
     error_summary: str | None = None
+    trigger_type: str = "MANUAL"
+    automatic_attempt: int = 0
 
 
 class TPlusBatchDetailOut(TPlusBatchOut):
@@ -97,6 +99,25 @@ class TPlusErrorOut(BaseModel):
     create_time: datetime
 
 
+class TPlusAutomationAlert(BaseModel):
+    code: str
+    message: str
+    batch_no: str | None = None
+
+
+class TPlusAutomationOverview(BaseModel):
+    enabled: bool = False
+    weekday: int = 0
+    time: str = "02:00"
+    timezone: str = "Asia/Shanghai"
+    worker_phase: str = "UNKNOWN"
+    heartbeat_at: datetime | None = None
+    last_success_at: datetime | None = None
+    next_retry_at: datetime | None = None
+    stop_requested: bool = False
+    alerts: list[TPlusAutomationAlert] = Field(default_factory=list)
+
+
 class TPlusOverviewOut(BaseModel):
     """配置就绪不等同于源库连通或兼容验收通过。"""
 
@@ -107,3 +128,4 @@ class TPlusOverviewOut(BaseModel):
     compatibility_status: str = "PENDING"
     business_import_enabled: bool = False
     latest_audit: dict | None = None
+    automation: TPlusAutomationOverview = Field(default_factory=TPlusAutomationOverview)