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/Models/Stats/Daily/StatHrAttendanceDaily.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Models\Stats\Daily;
+
+use App\Models\Stats\BaseStatModel;
+
+class StatHrAttendanceDaily extends BaseStatModel
+{
+    protected $table = 'stat_hr_attendance_daily';
+
+    protected $casts = [
+        'stat_date' => 'date',
+        'attendance_rate' => 'decimal:2',
+        'overtime_hours' => 'decimal:2',
+        'total_labor_cost' => 'decimal:2',
+    ];
+}

app/Models/Stats/Daily/StatInventoryDaily.php

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+<?php
+
+namespace App\Models\Stats\Daily;
+
+use App\Models\Stats\BaseStatModel;
+
+class StatInventoryDaily extends BaseStatModel
+{
+    protected $table = 'stat_inventory_daily';
+
+    protected $casts = [
+        'stat_date' => 'date',
+        'total_stock_qty' => 'decimal:2',
+        'total_stock_value' => 'decimal:2',
+        'receipt_qty' => 'decimal:2',
+        'receipt_amount' => 'decimal:2',
+        'issue_qty' => 'decimal:2',
+        'issue_amount' => 'decimal:2',
+        'inspection_pass_rate' => 'decimal:2',
+        'turnover_rate' => 'decimal:2',
+    ];
+}

app/Models/Stats/Daily/StatQuotePipelineDaily.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Models\Stats\Daily;
+
+use App\Models\Stats\BaseStatModel;
+
+class StatQuotePipelineDaily extends BaseStatModel
+{
+    protected $table = 'stat_quote_pipeline_daily';
+
+    protected $casts = [
+        'stat_date' => 'date',
+        'quote_amount' => 'decimal:2',
+        'quote_conversion_rate' => 'decimal:2',
+        'prospect_amount' => 'decimal:2',
+        'bidding_amount' => 'decimal:2',
+    ];
+}

app/Models/Stats/Dimensions/DimClient.php

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+<?php
+
+namespace App\Models\Stats\Dimensions;
+
+use App\Models\Stats\BaseStatModel;
+
+class DimClient extends BaseStatModel
+{
+    protected $table = 'dim_client';
+
+    public $timestamps = false;
+
+    protected $casts = [
+        'valid_from' => 'date',
+        'valid_to' => 'date',
+        'is_current' => 'boolean',
+    ];
+}

app/Models/Stats/Dimensions/DimProduct.php

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+<?php
+
+namespace App\Models\Stats\Dimensions;
+
+use App\Models\Stats\BaseStatModel;
+
+class DimProduct extends BaseStatModel
+{
+    protected $table = 'dim_product';
+
+    public $timestamps = false;
+
+    protected $casts = [
+        'valid_from' => 'date',
+        'valid_to' => 'date',
+        'is_current' => 'boolean',
+    ];
+}

app/Models/Stats/StatAlert.php

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+<?php
+
+namespace App\Models\Stats;
+
+class StatAlert extends BaseStatModel
+{
+    protected $table = 'stat_alerts';
+
+    public $timestamps = false;
+
+    protected $casts = [
+        'current_value' => 'decimal:2',
+        'threshold_value' => 'decimal:2',
+        'is_read' => 'boolean',
+        'is_resolved' => 'boolean',
+        'resolved_at' => 'datetime',
+        'created_at' => 'datetime',
+    ];
+}

app/Models/Stats/StatKpiTarget.php

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+<?php
+
+namespace App\Models\Stats;
+
+class StatKpiTarget extends BaseStatModel
+{
+    protected $table = 'stat_kpi_targets';
+
+    protected $casts = [
+        'target_value' => 'decimal:2',
+    ];
+}