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/UpdateRequest.php

@@ -13,12 +13,23 @@ public function authorize(): bool
 
     public function rules(): array
     {
+        $stepTypes = implode(',', \App\Models\Tenants\ApprovalLine::STEP_TYPES);
+
         return [
+            // form_id 또는 form_code
             'form_id' => 'nullable|integer|exists:approval_forms,id',
+            'form_code' => 'nullable|string|exists:approval_forms,code',
             'title' => 'nullable|string|max:200',
             'content' => 'nullable|array',
             'attachments' => 'nullable|array',
             'attachments.*' => 'integer|exists:files,id',
+            // 결재선 수정 지원
+            'steps' => 'nullable|array',
+            'steps.*.type' => "nullable|string|in:{$stepTypes}",
+            'steps.*.step_type' => "nullable|string|in:{$stepTypes}",
+            'steps.*.user_id' => 'nullable|integer|exists:users,id',
+            'steps.*.approver_id' => 'nullable|integer|exists:users,id',
+            'steps.*.step_order' => 'nullable|integer|min:1',
         ];
     }