fix: 고객센터 시스템 게시판 API 엔드포인트 및 날짜 필터 수정

- shared/actions.ts: /boards/ → /system-boards/ 엔드포인트 변경
- EventList, InquiryList, NoticeList: 날짜 범위 초기값 빈 문자열로 변경 (전체 조회)

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/Http/Requests/Approval/StoreRequest.php

@@ -17,15 +17,22 @@ public function rules(): array
         $stepTypes = implode(',', ApprovalLine::STEP_TYPES);
 
         return [
-            'form_id' => 'required|integer|exists:approval_forms,id',
+            // form_id 또는 form_code 중 하나 필수
+            'form_id' => 'required_without:form_code|integer|exists:approval_forms,id',
+            'form_code' => 'required_without:form_id|string|exists:approval_forms,code',
             'title' => 'required|string|max:200',
             'content' => 'required|array',
             'attachments' => 'nullable|array',
             'attachments.*' => 'integer|exists:files,id',
             'submit' => 'nullable|boolean',
             'steps' => 'required_if:submit,true|array|min:1',
-            'steps.*.type' => "required_with:steps|string|in:{$stepTypes}",
-            'steps.*.user_id' => 'required_with:steps|integer|exists:users,id',
+            // type 또는 step_type
+            'steps.*.type' => "nullable|string|in:{$stepTypes}",
+            'steps.*.step_type' => "nullable|string|in:{$stepTypes}",
+            // user_id 또는 approver_id
+            'steps.*.user_id' => 'nullable|integer|exists:users,id',
+            'steps.*.approver_id' => 'nullable|integer|exists:users,id',
+            'steps.*.step_order' => 'nullable|integer|min:1',
         ];
     }