refactor: products/materials 테이블 및 관련 코드 삭제

- products, materials, product_components 테이블 삭제 마이그레이션
- FK 제약조건 정리 (orders, order_items, material_receipts, lots)
- 관련 Models 삭제: Product, Material, ProductComponent 등
- 관련 Controllers 삭제: ProductController, MaterialController, ProductBomItemController
- 관련 Services 삭제: ProductService, MaterialService, ProductBomService
- 관련 Requests, Swagger 파일 삭제
- 라우트 정리: /products, /materials 엔드포인트 제거

모든 품목 관리는 /items 엔드포인트로 통합됨
item_id_mappings 테이블에 ID 매핑 보존

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

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

app/Models/Products/Product.php

@@ -1,118 +0,0 @@
-<?php
-
-namespace App\Models\Products;
-
-use App\Models\Commons\Category;
-use App\Models\Commons\File;
-use App\Models\Commons\Tag;
-use App\Traits\BelongsToTenant;
-use App\Traits\ModelTrait;
-use Illuminate\Database\Eloquent\Model;
-use Illuminate\Database\Eloquent\SoftDeletes;
-
-class Product extends Model
-{
-    use BelongsToTenant, ModelTrait, SoftDeletes;
-
-    protected $fillable = [
-        'tenant_id', 'code', 'name', 'unit', 'category_id',
-        'product_type', // 라벨/분류용
-        'attributes', 'attributes_archive', 'options', 'bom', 'description',
-        'is_sellable', 'is_purchasable', 'is_producible',
-        // 하이브리드 구조: 최소 고정 필드
-        'safety_stock', 'lead_time', 'is_variable_size',
-        'product_category', 'part_type',
-        // 파일 필드
-        'bending_diagram', 'bending_details',
-        'specification_file', 'specification_file_name',
-        'certification_file', 'certification_file_name',
-        'certification_number', 'certification_start_date', 'certification_end_date',
-        'created_by', 'updated_by', 'is_active',
-    ];
-
-    protected $casts = [
-        'attributes' => 'array',
-        'attributes_archive' => 'array',
-        'options' => 'array',
-        'bom' => 'array',
-        'bending_details' => 'array',
-        'certification_start_date' => 'date',
-        'certification_end_date' => 'date',
-        'is_sellable' => 'boolean',
-        'is_purchasable' => 'boolean',
-        'is_producible' => 'boolean',
-        'is_variable_size' => 'boolean',
-        'is_active' => 'boolean',
-    ];
-
-    protected $hidden = [
-        'deleted_at',
-    ];
-
-    // 분류
-    public function category()
-    {
-        return $this->belongsTo(Category::class, 'category_id');
-    }
-
-    // BOM (자기참조) — 라인 모델 경유
-    public function componentLines()
-    {
-        return $this->hasMany(ProductComponent::class, 'parent_product_id')->orderBy('sort_order');
-    }
-
-    // 라인들
-    public function parentLines()
-    {
-        return $this->hasMany(ProductComponent::class, 'child_product_id');
-    }  // 나를 쓰는 상위 라인들
-
-    // 편의: 직접 children/parents 제품에 접근
-    public function children()
-    {
-        return $this->belongsToMany(
-            self::class, 'product_components', 'parent_product_id', 'child_product_id'
-        )->withPivot(['quantity', 'sort_order', 'is_default'])
-            ->withTimestamps();
-    }
-
-    public function parents()
-    {
-        return $this->belongsToMany(
-            self::class, 'product_components', 'child_product_id', 'parent_product_id'
-        )->withPivot(['quantity', 'sort_order', 'is_default'])
-            ->withTimestamps();
-    }
-
-    // 파일 / 태그 (폴리모픽)
-    public function files()
-    {
-        return $this->morphMany(File::class, 'fileable');
-    }
-
-    public function tags()
-    {
-        return $this->morphToMany(Tag::class, 'taggable');
-    }
-
-    // 스코프
-    public function scopeType($q, string $type)
-    {
-        return $q->where('product_type', $type);
-    }
-
-    public function scopeSellable($q)
-    {
-        return $q->where('is_sellable', 1);
-    }
-
-    public function scopePurchasable($q)
-    {
-        return $q->where('is_purchasable', 1);
-    }
-
-    public function scopeProducible($q)
-    {
-        return $q->where('is_producible', 1);
-    }
-}