feat(labor): 노임관리 API 구현

- Labor 모델 (BelongsToTenant, SoftDeletes)
- LaborController 7개 엔드포인트
- LaborService 비즈니스 로직
- FormRequest 4개 (Index/Store/Update/BulkDelete)
- 마이그레이션 및 라우트 등록

API: GET/POST /labor, GET/PUT/DELETE /labor/{id}, DELETE /labor/bulk, GET /labor/stats

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

app/Http/Requests/Labor/LaborStoreRequest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace App\Http\Requests\Labor;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class LaborStoreRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'labor_number' => ['required', 'string', 'max:50'],
+            'category' => ['required', 'string', 'in:가로,세로할증'],
+            'min_m' => ['required', 'numeric', 'min:0', 'max:9999.99'],
+            'max_m' => ['required', 'numeric', 'min:0', 'max:9999.99', 'gte:min_m'],
+            'labor_price' => ['nullable', 'integer', 'min:0'],
+            'status' => ['required', 'string', 'in:사용,중지'],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'labor_number.required' => __('validation.required', ['attribute' => '노임번호']),
+            'category.required' => __('validation.required', ['attribute' => '구분']),
+            'category.in' => __('validation.in', ['attribute' => '구분']),
+            'min_m.required' => __('validation.required', ['attribute' => '최소(m)']),
+            'max_m.required' => __('validation.required', ['attribute' => '최대(m)']),
+            'max_m.gte' => __('validation.gte.numeric', ['attribute' => '최대(m)', 'value' => '최소(m)']),
+            'status.required' => __('validation.required', ['attribute' => '상태']),
+            'status.in' => __('validation.in', ['attribute' => '상태']),
+        ];
+    }
+}