fix: [item-master] 필드 수정 422 유효성 검증 오류 수정

- field_key regex를 숫자 시작도 허용하도록 변경 (기존 데이터 39건 호환)
- Handler.php 422 응답에 errors 최상위 필드 추가 (프론트엔드 호환)

app/Exceptions/Handler.php

@@ -84,6 +84,7 @@ public function render($request, Throwable $exception)
                 return response()->json([
                     'success' => false,
                     'message' => '입력값 검증 실패',
+                    'errors' => $exception->errors(),
                     'error' => [
                         'code' => 422,
                         'details' => $exception->errors(),

app/Http/Requests/ItemMaster/IndependentFieldStoreRequest.php

@@ -16,7 +16,7 @@ public function rules(): array
         return [
             'group_id' => 'nullable|integer',
             'field_name' => 'required|string|max:255',
-            'field_key' => 'nullable|string|max:80|regex:/^[a-zA-Z][a-zA-Z0-9_]*$/',
+            'field_key' => 'nullable|string|max:80|regex:/^[a-zA-Z0-9][a-zA-Z0-9_]*$/',
             'field_type' => 'required|in:textbox,number,dropdown,checkbox,date,textarea',
             'is_required' => 'nullable|boolean',
             'default_value' => 'nullable|string',

app/Http/Requests/ItemMaster/ItemFieldStoreRequest.php

@@ -16,7 +16,7 @@ public function rules(): array
         return [
             'group_id' => 'nullable|integer|min:1', // 계층번호
             'field_name' => 'required|string|max:255',
-            'field_key' => 'nullable|string|max:80|regex:/^[a-zA-Z][a-zA-Z0-9_]*$/',
+            'field_key' => 'nullable|string|max:80|regex:/^[a-zA-Z0-9][a-zA-Z0-9_]*$/',
             'field_type' => 'required|in:textbox,number,dropdown,checkbox,date,textarea',
             'is_required' => 'nullable|boolean',
             'default_value' => 'nullable|string',

app/Http/Requests/ItemMaster/ItemFieldUpdateRequest.php

@@ -15,7 +15,7 @@ public function rules(): array
     {
         return [
             'field_name' => 'sometimes|string|max:255',
-            'field_key' => 'nullable|string|max:80|regex:/^[a-zA-Z][a-zA-Z0-9_]*$/',
+            'field_key' => 'nullable|string|max:80|regex:/^[a-zA-Z0-9][a-zA-Z0-9_]*$/',
             'field_type' => 'sometimes|in:textbox,number,dropdown,checkbox,date,textarea',
             'is_required' => 'nullable|boolean',
             'default_value' => 'nullable|string',