fix(alerts): cash_plan 到期未收款预警引擎修复 — entity归属/KPI实体感知/余额快照批次/去重刷新/端点鉴权 (dama-cashplan-alert-engine-fix-20260913)

F1 两处 KPIAlert 显式写 entity_id（列默认 1 → 博海预警错挂酣客）；顺带修 deviation_engine/
   alert_generator/deviation_push/bot_bridge/bot_bridge_v2 同表创建点
F2 KPI 选择实体感知：候选码 ∪ 实体前缀后缀码（_AR_BALANCE/_CASH_BALANCE/_AP_BALANCE）
   + 兜底 ORDER BY id（此前命中 uk_entity_kpi 必中 BH_ADM_EXPENSE 437 管理费用）
F3 去重命中改为刷新 alert_message/等级/suggestion.days_late/归属（此前 continue → 文本冻结首版）
F4 余额快照批次（bohai_*_20260630 / receivables_migrate）开关：默认 skip 不逐户，另备
   aggregate(按批次聚合1条) / per_customer(旧行为)
F5 POST /api/cma/admin/alerts/check 补鉴权（无 token 401）+ 可选 entity_id 只跑指定账套

backend/app/api/bot_bridge.py

@@ -713,7 +713,7 @@ def bot_kpi_value_with_check(data: dict, db: Session = Depends(get_db), bot: dic
                         KPIAlert.kpi_id == kpi_id, KPIAlert.kpi_value_id == kv.id,
                         KPIAlert.alert_level == level, KPIAlert.status == "pending").first()
                     if not dup:
-                        db.add(KPIAlert(kpi_id=kpi_id, kpi_value_id=kv.id, alert_level=level,
+                        db.add(KPIAlert(entity_id=entity_id, kpi_id=kpi_id, kpi_value_id=kv.id, alert_level=level,
                                         alert_message=msg, status="pending", alert_type="bot"))
                         alerts.append({"rule_id": rule.id, "rule_type": rule.rule_type,
                                        "level": level, "message": msg})

backend/app/api/bot_bridge_v2.py

@@ -380,6 +380,7 @@ def receive_mpm_result(
             # 创建预警
             alert_msg = f"⚠️ {kpi_name}异常: {field_value:.1f}% (阈值: {threshold}%) [entity={entity.short_name or entity.name}, period={period}]"
             alert = KPIAlert(
+                entity_id=entity_id,   # 2026-09-13 F1: 显式写归属
                 kpi_id=kpi_id or 1,  # fallback to first KPI if not found
                 alert_level="red",
                 alert_message=alert_msg,

backend/app/api/deviation_push.py

@@ -131,6 +131,7 @@ def push_deviation_to_map(
 
         if alert_level:
             alert = KPIAlert(
+                entity_id=kpi.entity_id or 1,   # 2026-09-13 F1: 显式写归属
                 kpi_id=kpi.id,
                 alert_level=alert_level,
                 alert_message=alert_msg,