fix: ItemsFileController 파일 API 오류 수정

- delete() 메서드  타입을 mixed로 변경 + 내부 캐스팅
- userId null 처리 (auth()->id() ?? app('api_user'))
- deleteFile() private 메서드로 삭제 로직 일원화
- getFileUrl()을 file_id 기반으로 변경 (/api/v1/files/{id}/download)
- LOGICAL_RELATIONSHIPS.md items 통합 반영

LOGICAL_RELATIONSHIPS.md

@@ -1,6 +1,6 @@
 # 논리적 데이터베이스 관계 문서
 
-> **자동 생성**: 2025-12-11 21:54:15
+> **자동 생성**: 2025-12-15 13:50:25
 > **소스**: Eloquent 모델 관계 분석
 
 ## 📊 모델별 관계 현황
@@ -44,7 +44,6 @@ ### categorys
 
 - **parent()**: belongsTo → `categories`
 - **children()**: hasMany → `categories`
-- **products()**: hasMany → `products`
 - **categoryFields()**: hasMany → `category_fields`
 
 ### category_fields
@@ -163,6 +162,18 @@ ### tab_columns
 
 - **tab()**: belongsTo → `custom_tabs`
 
+### items
+**모델**: `App\Models\Items\Item`
+
+- **category()**: belongsTo → `categories`
+- **details()**: hasOne → `item_details`
+- **files()**: morphMany → `files`
+
+### item_details
+**모델**: `App\Models\Items\ItemDetail`
+
+- **item()**: belongsTo → `items`
+
 ### main_requests
 **모델**: `App\Models\MainRequest`
 
@@ -174,14 +185,6 @@ ### main_request_flows
 - **mainRequest()**: belongsTo → `main_requests`
 - **flowable()**: morphTo → `(Polymorphic)`
 
-### materials
-**모델**: `App\Models\Materials\Material`
-
-- **category()**: belongsTo → `categories`
-- **receipts()**: hasMany → `material_receipts`
-- **lots()**: hasMany → `lots`
-- **files()**: morphMany → `files`
-
 ### material_inspections
 **모델**: `App\Models\Materials\MaterialInspection`
 
@@ -196,7 +199,7 @@ ### material_inspection_items
 ### material_receipts
 **모델**: `App\Models\Materials\MaterialReceipt`
 
-- **material()**: belongsTo → `materials`
+- **item()**: belongsTo → `items`
 - **inspections()**: hasMany → `material_inspections`
 
 ### users
@@ -242,6 +245,7 @@ ### client_groups
 ### orders
 **모델**: `App\Models\Orders\Order`
 
+- **item()**: belongsTo → `items`
 - **items()**: hasMany → `order_items`
 - **histories()**: hasMany → `order_histories`
 - **versions()**: hasMany → `order_versions`
@@ -255,6 +259,7 @@ ### order_items
 **모델**: `App\Models\Orders\OrderItem`
 
 - **order()**: belongsTo → `orders`
+- **item()**: belongsTo → `items`
 - **components()**: hasMany → `order_item_components`
 
 ### order_item_components
@@ -290,53 +295,10 @@ ### role_menu_permissions
 - **role()**: belongsTo → `roles`
 - **menu()**: belongsTo → `menus`
 
-### common_codes
-**모델**: `App\Models\Products\CommonCode`
-
-- **parent()**: belongsTo → `common_codes`
-- **children()**: hasMany → `common_codes`
-
-### parts
-**모델**: `App\Models\Products\Part`
-
-- **category()**: belongsTo → `common_codes`
-- **partType()**: belongsTo → `common_codes`
-
-### prices
-**모델**: `App\Models\Products\Price`
-
-- **clientGroup()**: belongsTo → `client_groups`
-- **product()**: belongsTo → `products`
-- **material()**: belongsTo → `materials`
-- **revisions()**: hasMany → `price_revisions`
-
-### price_revisions
-**모델**: `App\Models\Products\PriceRevision`
-
-- **price()**: belongsTo → `prices`
-- **changedByUser()**: belongsTo → `users`
-
-### products
-**모델**: `App\Models\Products\Product`
-
-- **category()**: belongsTo → `categories`
-- **componentLines()**: hasMany → `product_components`
-- **parentLines()**: hasMany → `product_components`
-- **children()**: belongsToMany → `products`
-- **parents()**: belongsToMany → `products`
-- **files()**: morphMany → `files`
-
-### product_components
-**모델**: `App\Models\Products\ProductComponent`
-
-- **parentProduct()**: belongsTo → `products`
-- **product()**: belongsTo → `products`
-- **material()**: belongsTo → `materials`
-
 ### lots
 **모델**: `App\Models\Qualitys\Lot`
 
-- **material()**: belongsTo → `materials`
+- **item()**: belongsTo → `items`
 - **sales()**: hasMany → `lot_sales`
 
 ### lot_sales
@@ -348,6 +310,7 @@ ### quotes
 **모델**: `App\Models\Quote\Quote`
 
 - **client()**: belongsTo → `clients`
+- **item()**: belongsTo → `items`
 - **finalizer()**: belongsTo → `users`
 - **creator()**: belongsTo → `users`
 - **updater()**: belongsTo → `users`