feat: [hr] Leave 모델 확장 + 결재양식 마이그레이션 추가

- Leave 타입 6개 추가: business_trip, remote, field_work, early_leave, late_reason, absent_reason
- 그룹 상수 추가: VACATION_TYPES, ATTENDANCE_REQUEST_TYPES, REASON_REPORT_TYPES
- FORM_CODE_MAP: 유형 → 결재양식코드 매핑 상수
- ATTENDANCE_STATUS_MAP: 유형 → 근태상태 매핑 상수
- 결재양식 2개 추가: attendance_request(근태신청), reason_report(사유서)

database/migrations/2026_03_03_100100_insert_attendance_approval_forms.php

@@ -0,0 +1,59 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        // 근태신청 결재 양식 (출장/재택/외근/조퇴)
+        DB::table('approval_forms')->insertOrIgnore([
+            'tenant_id' => 1,
+            'name' => '근태신청',
+            'code' => 'attendance_request',
+            'category' => 'request',
+            'template' => json_encode([
+                'fields' => [
+                    ['name' => 'user_name', 'type' => 'text', 'label' => '신청자'],
+                    ['name' => 'request_type', 'type' => 'text', 'label' => '신청유형'],
+                    ['name' => 'period', 'type' => 'text', 'label' => '기간'],
+                    ['name' => 'days', 'type' => 'number', 'label' => '일수'],
+                    ['name' => 'reason', 'type' => 'text', 'label' => '사유'],
+                ],
+            ], JSON_UNESCAPED_UNICODE),
+            'is_active' => true,
+            'created_by' => 1,
+            'created_at' => now(),
+            'updated_at' => now(),
+        ]);
+
+        // 사유서 결재 양식 (지각사유서/결근사유서)
+        DB::table('approval_forms')->insertOrIgnore([
+            'tenant_id' => 1,
+            'name' => '사유서',
+            'code' => 'reason_report',
+            'category' => 'request',
+            'template' => json_encode([
+                'fields' => [
+                    ['name' => 'user_name', 'type' => 'text', 'label' => '신청자'],
+                    ['name' => 'report_type', 'type' => 'text', 'label' => '사유서유형'],
+                    ['name' => 'target_date', 'type' => 'date', 'label' => '대상일'],
+                    ['name' => 'reason', 'type' => 'text', 'label' => '사유'],
+                ],
+            ], JSON_UNESCAPED_UNICODE),
+            'is_active' => true,
+            'created_by' => 1,
+            'created_at' => now(),
+            'updated_at' => now(),
+        ]);
+    }
+
+    public function down(): void
+    {
+        DB::table('approval_forms')
+            ->where('tenant_id', 1)
+            ->whereIn('code', ['attendance_request', 'reason_report'])
+            ->delete();
+    }
+};