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/PriceRevision.php

@@ -1,92 +0,0 @@
-<?php
-
-namespace App\Models\Products;
-
-use App\Traits\BelongsToTenant;
-use Illuminate\Database\Eloquent\Model;
-use Illuminate\Database\Eloquent\Relations\BelongsTo;
-
-/**
- * 단가 변경 이력 모델
- *
- * @property int $id
- * @property int $tenant_id
- * @property int $price_id
- * @property int $revision_number
- * @property \Carbon\Carbon $changed_at
- * @property int $changed_by
- * @property string|null $change_reason
- * @property array|null $before_snapshot
- * @property array $after_snapshot
- */
-class PriceRevision extends Model
-{
-    use BelongsToTenant;
-
-    public $timestamps = false;
-
-    protected $fillable = [
-        'tenant_id',
-        'price_id',
-        'revision_number',
-        'changed_at',
-        'changed_by',
-        'change_reason',
-        'before_snapshot',
-        'after_snapshot',
-    ];
-
-    protected $casts = [
-        'revision_number' => 'integer',
-        'changed_at' => 'datetime',
-        'before_snapshot' => 'array',
-        'after_snapshot' => 'array',
-    ];
-
-    /**
-     * 단가 관계
-     */
-    public function price(): BelongsTo
-    {
-        return $this->belongsTo(Price::class, 'price_id');
-    }
-
-    /**
-     * 변경자 관계
-     */
-    public function changedByUser(): BelongsTo
-    {
-        return $this->belongsTo(\App\Models\Members\User::class, 'changed_by');
-    }
-
-    /**
-     * 변경된 필드 목록 추출
-     */
-    public function getChangedFields(): array
-    {
-        if (! $this->before_snapshot) {
-            return array_keys($this->after_snapshot ?? []);
-        }
-
-        $changed = [];
-        foreach ($this->after_snapshot as $key => $newValue) {
-            $oldValue = $this->before_snapshot[$key] ?? null;
-            if ($oldValue !== $newValue) {
-                $changed[] = $key;
-            }
-        }
-
-        return $changed;
-    }
-
-    /**
-     * 특정 필드의 이전/이후 값
-     */
-    public function getFieldChange(string $field): array
-    {
-        return [
-            'before' => $this->before_snapshot[$field] ?? null,
-            'after' => $this->after_snapshot[$field] ?? null,
-        ];
-    }
-}