feat: sam_stat P1 도메인 확장 (Phase 3)

- 차원 테이블: dim_client, dim_product 마이그레이션 + SCD Type 2 동기화 (DimensionSyncService)
- 재고 통계: stat_inventory_daily + InventoryStatService (stocks, stock_transactions, inspections)
- 견적/영업 통계: stat_quote_pipeline_daily + QuoteStatService (quotes, biddings, sales_prospects)
- 인사/근태 통계: stat_hr_attendance_daily + HrStatService (attendances, leaves, user_tenants)
- KPI/알림: stat_kpi_targets, stat_alerts + KpiAlertService + StatCheckKpiAlertsCommand
- StatAggregatorService에 inventory, quote, hr 도메인 추가 (총 6개 도메인)
- 스케줄러: stat:check-kpi-alerts 매일 09:00 등록

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/Console/Commands/StatCheckKpiAlertsCommand.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Services\Stats\KpiAlertService;
+use Illuminate\Console\Command;
+
+class StatCheckKpiAlertsCommand extends Command
+{
+    protected $signature = 'stat:check-kpi-alerts';
+
+    protected $description = 'KPI 목표 대비 실적을 체크하고 미달 시 알림을 생성합니다';
+
+    public function handle(KpiAlertService $service): int
+    {
+        $this->info('KPI 알림 체크 시작...');
+
+        $result = $service->checkKpiAlerts();
+
+        $this->info("알림 생성: {$result['alerts_created']}건");
+
+        if (! empty($result['errors'])) {
+            $this->warn('오류 발생:');
+            foreach ($result['errors'] as $error) {
+                $this->error("  - {$error}");
+            }
+        }
+
+        $this->info('KPI 알림 체크 완료.');
+
+        return empty($result['errors']) ? self::SUCCESS : self::FAILURE;
+    }
+}