feat: [hr] 인사관리 사원관리 Phase 1 구현

- Employee, Position 모델 생성 (tenant_user_profiles, positions 테이블)
- EmployeeService 생성 (CRUD, 통계, 필터/검색/페이지네이션)
- 뷰 컨트롤러(HR/EmployeeController) + API 컨트롤러 생성
- Blade 뷰: index(통계카드+HTMX테이블), create, edit, show, partials/table
- 라우트: web.php(/hr/employees/*), api.php(/admin/hr/employees/*)

app/Models/HR/Position.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Models\HR;
+
+use App\Traits\ModelTrait;
+use Illuminate\Database\Eloquent\Model;
+
+class Position extends Model
+{
+    use ModelTrait;
+
+    protected $table = 'positions';
+
+    protected $fillable = [
+        'tenant_id',
+        'type',
+        'key',
+        'name',
+        'sort_order',
+        'is_active',
+    ];
+
+    protected $casts = [
+        'tenant_id' => 'int',
+        'sort_order' => 'int',
+        'is_active' => 'bool',
+    ];
+
+    public const TYPE_RANK = 'rank';
+
+    public const TYPE_TITLE = 'title';
+
+    // =========================================================================
+    // 스코프
+    // =========================================================================
+
+    public function scopeForTenant($query, ?int $tenantId = null)
+    {
+        $tenantId = $tenantId ?? session('selected_tenant_id');
+        if ($tenantId) {
+            return $query->where('tenant_id', $tenantId);
+        }
+
+        return $query;
+    }
+
+    public function scopeRanks($query)
+    {
+        return $query->where('type', self::TYPE_RANK);
+    }
+
+    public function scopeTitles($query)
+    {
+        return $query->where('type', self::TYPE_TITLE);
+    }
+
+    public function scopeOrdered($query)
+    {
+        return $query->orderBy('sort_order');
+    }
+}