fix: cancel된 job도 DB에 상태 기록

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

nanoclaude/services/worker.py

@@ -44,6 +44,11 @@ async def run(job: Job) -> None:
             if job.status == JobStatus.cancelled:
                 logger.info("Job %s cancelled during streaming", job.id)
                 await state_stream.push(job.id, "error", {"message": "작업이 취소되었습니다."})
+                latency_ms = (time() - start_time) * 1000
+                try:
+                    await log_completion(job.id, "cancelled", len("".join(collected)), latency_ms, time())
+                except Exception:
+                    pass
                 return
 
             collected.append(chunk)