fix: Codex 리뷰 5건 수정 (critical 1 + high 4)

1. [critical] config.yaml → settings 객체에서 taxonomy 로드 (import crash 방지)
2. [high] ODF 변환: file_path 유지, derived_path 별도 필드 (무한 중복 방지)
3. [high] 법령 분할: 첫 장 이전 조문을 "서문"으로 보존
4. [high] Inbox: review_status 필드 분리 (pending/approved/rejected)
5. [high] 삭제: soft-delete (deleted_at) + worker 방어 + active_documents 뷰
   - 모든 조회에 deleted_at IS NULL 일관 적용
   - queue_consumer: row 없으면 gracefully skip

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/workers/queue_consumer.py

@@ -112,6 +112,9 @@ async def consume_queue():
                 # 완료 처리
                 async with async_session() as session:
                     item = await session.get(ProcessingQueue, queue_id)
+                    if not item:
+                        logger.warning(f"[{stage}] queue_id={queue_id} 없음 (삭제됨?), skip")
+                        continue
                     item.status = "completed"
                     item.completed_at = datetime.now(timezone.utc)
                     await session.commit()
@@ -123,6 +126,9 @@ async def consume_queue():
                 # 실패 처리
                 async with async_session() as session:
                     item = await session.get(ProcessingQueue, queue_id)
+                    if not item:
+                        logger.warning(f"[{stage}] queue_id={queue_id} 없음 (삭제됨?), skip")
+                        continue
                     item.error_message = str(e)[:500]
                     if item.attempts >= item.max_attempts:
                         item.status = "failed"