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>

frontend/src/components/AppShell.jsx

@@ -128,6 +128,7 @@ export default function AppShell({
   stockRequests,
   // Agent request handlers
   agentRequests,
+  agentProfilesByAgent,
   // Layout
   leftWidth,
   isResizing,
@@ -440,6 +441,7 @@ export default function AppShell({
                         bubbles={bubbles}
                         bubbleFor={bubbleFor}
                         leaderboard={leaderboard}
+                        agentProfilesByAgent={agentProfilesByAgent}
                         feed={feed}
                         onJumpToMessage={handleJumpToMessage}
                         onOpenLaunchConfig={() => setIsRuntimeSettingsOpen(true)}
@@ -518,6 +520,7 @@ export default function AppShell({
                         trades={trades}
                         holdings={holdings}
                         stats={stats}
+                        portfolioData={portfolioData}
                         baseline_vw={portfolioData.baseline_vw}
                         equity={portfolioData.equity}
                         leaderboard={leaderboard}
@@ -535,7 +538,7 @@ export default function AppShell({
           {/* Right Panel: Agent Feed */}
           <div className="right-panel" style={{ width: `${100 - leftWidth}%` }}>
             <Suspense fallback={<ViewLoadingFallback label="加载消息流..." />}>
-              <AgentFeed ref={agentFeedRef} feed={feed} leaderboard={leaderboard} />
+              <AgentFeed ref={agentFeedRef} feed={feed} leaderboard={leaderboard} agentProfilesByAgent={agentProfilesByAgent} />
             </Suspense>
           </div>
         </div>