fix(agent-office): 일요 회고 견고화 (dead import 제거·send 가드·부분 payload 방어)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

agent-office/app/service_proxy.py

@@ -406,13 +406,6 @@ async def lotto_backtest_review(draw_no: int) -> Dict[str, Any]:
     return resp.json()
 
 
-async def lotto_backtest_run_forward(draw_no: int) -> Dict[str, Any]:
-    from .config import LOTTO_BACKEND_URL
-    resp = await _client.post(f"{LOTTO_BACKEND_URL}/api/lotto/backtest/run-forward",
-                              params={"draw_no": draw_no})
-    resp.raise_for_status()
-    return resp.json()
-
 
 from .config import AGENT_CONTAINER_MAP