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>

database/migrations/2026_01_11_000000_create_labors_table.php

@@ -0,0 +1,44 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('labors', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('tenant_id')->comment('테넌트 ID');
+            $table->string('labor_number', 50)->comment('노임번호');
+            $table->enum('category', ['가로', '세로할증'])->comment('구분');
+            $table->decimal('min_m', 10, 2)->default(0)->comment('최소 m');
+            $table->decimal('max_m', 10, 2)->default(0)->comment('최대 m');
+            $table->unsignedInteger('labor_price')->nullable()->comment('노임단가');
+            $table->enum('status', ['사용', '중지'])->default('사용')->comment('상태');
+            $table->boolean('is_active')->default(true)->comment('활성화 여부 (ModelTrait::scopeActive() 사용)');
+            $table->unsignedBigInteger('created_by')->nullable()->comment('생성자 ID');
+            $table->unsignedBigInteger('updated_by')->nullable()->comment('수정자 ID');
+            $table->unsignedBigInteger('deleted_by')->nullable()->comment('삭제자 ID');
+            $table->timestamps();
+            $table->softDeletes();
+
+            // 인덱스
+            $table->index(['tenant_id', 'category'], 'idx_tenant_category');
+            $table->index(['tenant_id', 'status'], 'idx_tenant_status');
+            $table->index(['tenant_id', 'labor_number'], 'idx_tenant_labor_number');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('labors');
+    }
+};