feat: G-1 작업지시 관리 API 구현

- 작업지시 테이블 마이그레이션 (work_orders, work_order_items, work_order_bending_details, work_order_issues)
- 작업지시 모델 4개 (WorkOrder, WorkOrderItem, WorkOrderBendingDetail, WorkOrderIssue)
- WorkOrderService 비즈니스 로직 구현
- WorkOrderController REST API 엔드포인트 11개
- FormRequest 검증 클래스 5개
- Swagger API 문서화 완료

API Endpoints:
- GET /work-orders (목록)
- GET /work-orders/stats (통계)
- POST /work-orders (등록)
- GET /work-orders/{id} (상세)
- PUT /work-orders/{id} (수정)
- DELETE /work-orders/{id} (삭제)
- PATCH /work-orders/{id}/status (상태변경)
- PATCH /work-orders/{id}/assign (담당자배정)
- PATCH /work-orders/{id}/bending/toggle (벤딩토글)
- POST /work-orders/{id}/issues (이슈등록)
- PATCH /work-orders/{id}/issues/{issueId}/resolve (이슈해결)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/Models/Production/WorkOrderBendingDetail.php

@@ -0,0 +1,131 @@
+<?php
+
+namespace App\Models\Production;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * 작업지시 벤딩 상세 모델
+ *
+ * 벤딩 공정의 세부 작업 항목 완료 상태를 추적
+ */
+class WorkOrderBendingDetail extends Model
+{
+    protected $table = 'work_order_bending_details';
+
+    protected $fillable = [
+        'work_order_id',
+        'shaft_cutting',
+        'bearing',
+        'shaft_welding',
+        'assembly',
+        'winder_welding',
+        'frame_assembly',
+        'bundle_assembly',
+        'motor_assembly',
+        'bracket_assembly',
+    ];
+
+    protected $casts = [
+        'shaft_cutting' => 'boolean',
+        'bearing' => 'boolean',
+        'shaft_welding' => 'boolean',
+        'assembly' => 'boolean',
+        'winder_welding' => 'boolean',
+        'frame_assembly' => 'boolean',
+        'bundle_assembly' => 'boolean',
+        'motor_assembly' => 'boolean',
+        'bracket_assembly' => 'boolean',
+    ];
+
+    /**
+     * 벤딩 공정 항목 목록
+     */
+    public const PROCESS_FIELDS = [
+        'shaft_cutting',
+        'bearing',
+        'shaft_welding',
+        'assembly',
+        'winder_welding',
+        'frame_assembly',
+        'bundle_assembly',
+        'motor_assembly',
+        'bracket_assembly',
+    ];
+
+    // ──────────────────────────────────────────────────────────────
+    // 관계
+    // ──────────────────────────────────────────────────────────────
+
+    /**
+     * 작업지시
+     */
+    public function workOrder(): BelongsTo
+    {
+        return $this->belongsTo(WorkOrder::class);
+    }
+
+    // ──────────────────────────────────────────────────────────────
+    // 헬퍼 메서드
+    // ──────────────────────────────────────────────────────────────
+
+    /**
+     * 완료된 항목 수
+     */
+    public function getCompletedCountAttribute(): int
+    {
+        $count = 0;
+        foreach (self::PROCESS_FIELDS as $field) {
+            if ($this->{$field}) {
+                $count++;
+            }
+        }
+
+        return $count;
+    }
+
+    /**
+     * 전체 항목 수
+     */
+    public function getTotalCountAttribute(): int
+    {
+        return count(self::PROCESS_FIELDS);
+    }
+
+    /**
+     * 진행률 (%)
+     */
+    public function getProgressPercentAttribute(): int
+    {
+        $total = $this->total_count;
+        if ($total === 0) {
+            return 0;
+        }
+
+        return (int) round(($this->completed_count / $total) * 100);
+    }
+
+    /**
+     * 모든 항목이 완료되었는지 확인
+     */
+    public function isAllCompleted(): bool
+    {
+        return $this->completed_count === $this->total_count;
+    }
+
+    /**
+     * 특정 항목 토글
+     */
+    public function toggleField(string $field): bool
+    {
+        if (! in_array($field, self::PROCESS_FIELDS)) {
+            return false;
+        }
+
+        $this->{$field} = ! $this->{$field};
+        $this->save();
+
+        return true;
+    }
+}