feat: NanoClaude Phase 3 — Synology Chat 연동

- POST /webhook/synology: outgoing webhook 수신 + token 검증
- 파이프라인 완료 시 incoming webhook으로 응답 자동 전송
- "분석 중..." typing 메시지 선전송
- 응답 길이 1500자 제한 (Synology Chat 제한 대응)
- 에러/실패 시에도 사용자에게 알림 메시지 전송
- 중복 요청 방지 (30초 TTL dedup)
- Synology에서 rewrite 이벤트 숨김 (SSE에서만 노출)
- callback 구조로 확장 가능 (Slack, Discord 등)

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

nanoclaude/services/worker.py

@@ -12,12 +12,14 @@ from models.schemas import JobStatus
 from services.backend_registry import backend_registry
 from services.job_manager import Job, job_manager
 from services.state_stream import state_stream
+from services.synology_sender import send_to_synology
 
 logger = logging.getLogger(__name__)
 
 HEARTBEAT_INTERVAL = 4.0
 REWRITE_HEARTBEAT = 2.0
 MAX_REWRITE_LENGTH = 1000
+SYNOLOGY_MAX_LEN = 1500
 
 
 async def _complete_with_heartbeat(adapter, message: str, job_id: str) -> str:
@@ -113,8 +115,9 @@ async def run(job: Job) -> None:
             rewrite_latency = (time() - rewrite_start) * 1000
             job.rewritten_message = rewritten_message
 
-            # --- Rewrite 결과 SSE 노출 ---
-            await state_stream.push(job.id, "rewrite", {"content": rewritten_message})
+            # --- Rewrite 결과 SSE 노출 (Synology에서는 숨김) ---
+            if job.callback != "synology":
+                await state_stream.push(job.id, "rewrite", {"content": rewritten_message})
 
             # --- Cancel 체크 #2 ---
             if job.status == JobStatus.cancelled:
@@ -146,10 +149,18 @@ async def run(job: Job) -> None:
             job_manager.set_status(job.id, JobStatus.failed)
             await state_stream.push(job.id, "error", {"message": "응답을 받지 못했습니다."})
             status = "failed"
+            if job.callback == "synology":
+                await send_to_synology("⚠️ 응답을 받지 못했습니다. 다시 시도해주세요.")
         else:
             job_manager.set_status(job.id, JobStatus.completed)
             await state_stream.push(job.id, "done", {"message": "완료"})
             status = "completed"
+            # Synology callback: 결과 전송
+            if job.callback == "synology":
+                full_response = "".join(collected)
+                if len(full_response) > SYNOLOGY_MAX_LEN:
+                    full_response = full_response[:SYNOLOGY_MAX_LEN] + "\n\n...(생략됨)"
+                await send_to_synology(full_response)
 
         # --- DB 로깅 ---
         latency_ms = (time() - start_time) * 1000
@@ -176,6 +187,11 @@ async def run(job: Job) -> None:
         logger.exception("Worker failed for job %s", job.id)
         job_manager.set_status(job.id, JobStatus.failed)
         await state_stream.push(job.id, "error", {"message": "내부 오류가 발생했습니다."})
+        if job.callback == "synology":
+            try:
+                await send_to_synology("⚠️ 처리 중 오류가 발생했습니다. 다시 시도해주세요.")
+            except Exception:
+                pass
         try:
             await log_completion(job.id, "failed", 0, (time() - start_time) * 1000, time())
         except Exception: