feat: 添加新闻增量刷新和前端组件修复

- 新增 refresh_news_incremental/refresh_news_for_symbols 函数支持增量新闻获取
- 在 live cycle 中集成新闻刷新逻辑
- AgentFeed 支持 agentProfilesByAgent 显示模型信息
- StatisticsView 修复 stats 计算逻辑，使用 portfolioData 作为 fallback
- StockExplainView 修复 useEffect 依赖项问题
- AppShell/RoomView 传递 agentProfilesByAgent 属性
- start-dev.sh 调整日志级别为 warning 减少噪音

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/services/gateway_cycle_support.py

@@ -7,7 +7,7 @@ import asyncio
 import logging
 from typing import Any
 
-from backend.data.market_ingest import ingest_symbols
+from backend.data.market_ingest import ingest_symbols, refresh_news_for_symbols
 from backend.domains import trading as trading_domain
 from backend.utils.msg_adapter import FrontendAdapter
 
@@ -200,6 +200,23 @@ async def run_live_cycle(gateway: Any, date: str, tickers: list[str]) -> None:
     trading_date = gateway.market_service.get_live_trading_date()
     logger.info("Live cycle: triggered=%s, trading_date=%s", date, trading_date)
 
+    try:
+        news_refresh = await asyncio.to_thread(
+            refresh_news_for_symbols,
+            tickers,
+            end_date=trading_date,
+            store=gateway.storage.market_store,
+        )
+        logger.info(
+            "News refresh complete: %s",
+            ", ".join(
+                f"{item['symbol']} news={item['news']}"
+                for item in news_refresh
+            ) or "no symbols",
+        )
+    except Exception as exc:
+        logger.warning("Live cycle news refresh failed: %s", exc)
+
     await gateway.state_sync.on_cycle_start(trading_date)
     gateway._dashboard.update(date=trading_date, status="Analyzing...")