feat: [approval] 결재관리 시스템 MNG 스타일로 전면 개선

- 보류/보류해제 기능 추가 (hold, releaseHold)
- 전결 기능 추가 (preDecide - 이후 결재 건너뛰고 최종 승인)
- 복사 재기안 기능 추가 (copyForRedraft)
- 반려 후 재상신 로직 (rejection_history 저장, resubmit_count 증가)
- 결재자 스냅샷 저장 (approver_name, department, position)
- 완료함 목록/현황 API 추가 (completed, completedSummary)
- 뱃지 카운트 API 추가 (badgeCounts)
- 완료함 일괄 읽음 처리 (markCompletedAsRead)
- 위임 관리 CRUD API 추가 (delegations)
- Leave 연동 (승인/반려/회수/삭제 시 휴가 상태 동기화)
- ApprovalDelegation 모델 신규 생성
- STATUS_ON_HOLD 상수 추가 (Approval, ApprovalStep)
- isEditable/isSubmittable 반려 상태 허용으로 확장
- isCancellable 보류 상태 포함
- 회수 시 첫 번째 결재자 처리 여부 검증 추가
- i18n 에러/메시지 키 추가

app/Http/Controllers/Api/V1/ApprovalController.php

@@ -155,11 +155,104 @@ public function reject(int $id, RejectRequest $request): JsonResponse
      * 결재 회수 (기안자만)
      * POST /v1/approvals/{id}/cancel
      */
-    public function cancel(int $id): JsonResponse
+    public function cancel(int $id, Request $request): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($id, $request) {
+            return $this->service->cancel($id, $request->input('recall_reason'));
+        }, __('message.approval.cancelled'));
+    }
+
+    /**
+     * 보류 (현재 결재자만)
+     * POST /v1/approvals/{id}/hold
+     */
+    public function hold(int $id, Request $request): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($id, $request) {
+            $comment = $request->input('comment');
+            if (empty($comment)) {
+                throw new \Symfony\Component\HttpKernel\Exception\BadRequestHttpException(__('error.approval.comment_required'));
+            }
+
+            return $this->service->hold($id, $comment);
+        }, __('message.approval.held'));
+    }
+
+    /**
+     * 보류 해제 (보류한 결재자만)
+     * POST /v1/approvals/{id}/release-hold
+     */
+    public function releaseHold(int $id): JsonResponse
     {
         return ApiResponse::handle(function () use ($id) {
-            return $this->service->cancel($id);
-        }, __('message.approval.cancelled'));
+            return $this->service->releaseHold($id);
+        }, __('message.approval.hold_released'));
+    }
+
+    /**
+     * 전결 (현재 결재자가 이후 모든 결재를 건너뛰고 최종 승인)
+     * POST /v1/approvals/{id}/pre-decide
+     */
+    public function preDecide(int $id, Request $request): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($id, $request) {
+            return $this->service->preDecide($id, $request->input('comment'));
+        }, __('message.approval.pre_decided'));
+    }
+
+    /**
+     * 복사 재기안
+     * POST /v1/approvals/{id}/copy
+     */
+    public function copyForRedraft(int $id): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($id) {
+            return $this->service->copyForRedraft($id);
+        }, __('message.approval.copied'));
+    }
+
+    /**
+     * 완료함 목록
+     * GET /v1/approvals/completed
+     */
+    public function completed(IndexRequest $request): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($request) {
+            return $this->service->completed($request->validated());
+        }, __('message.fetched'));
+    }
+
+    /**
+     * 완료함 현황 카드
+     * GET /v1/approvals/completed/summary
+     */
+    public function completedSummary(): JsonResponse
+    {
+        return ApiResponse::handle(function () {
+            return $this->service->completedSummary();
+        }, __('message.fetched'));
+    }
+
+    /**
+     * 미처리 건수 (뱃지용)
+     * GET /v1/approvals/badge-counts
+     */
+    public function badgeCounts(): JsonResponse
+    {
+        return ApiResponse::handle(function () {
+            return $this->service->badgeCounts();
+        }, __('message.fetched'));
+    }
+
+    /**
+     * 완료함 미읽음 일괄 읽음 처리
+     * POST /v1/approvals/completed/mark-read
+     */
+    public function markCompletedAsRead(): JsonResponse
+    {
+        return ApiResponse::handle(function () {
+            return $this->service->markCompletedAsRead();
+        }, __('message.approval.marked_read'));
     }
 
     /**
@@ -183,4 +276,52 @@ public function markUnread(int $id): JsonResponse
             return $this->service->markUnread($id);
         }, __('message.approval.marked_unread'));
     }
+
+    // =========================================================================
+    // 위임 관리
+    // =========================================================================
+
+    /**
+     * 위임 목록
+     * GET /v1/approvals/delegations
+     */
+    public function delegationIndex(Request $request): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($request) {
+            return $this->service->delegationIndex($request->all());
+        }, __('message.fetched'));
+    }
+
+    /**
+     * 위임 생성
+     * POST /v1/approvals/delegations
+     */
+    public function delegationStore(Request $request): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($request) {
+            return $this->service->delegationStore($request->all());
+        }, __('message.created'));
+    }
+
+    /**
+     * 위임 수정
+     * PATCH /v1/approvals/delegations/{id}
+     */
+    public function delegationUpdate(int $id, Request $request): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($id, $request) {
+            return $this->service->delegationUpdate($id, $request->all());
+        }, __('message.updated'));
+    }
+
+    /**
+     * 위임 삭제
+     * DELETE /v1/approvals/delegations/{id}
+     */
+    public function delegationDestroy(int $id): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($id) {
+            return $this->service->delegationDestroy($id);
+        }, __('message.deleted'));
+    }
 }