清理死代码:移除 14 个孤立组件/模块,Koyfin 品牌改为 PolyWeather
删除的文件: - ContinentGroupHeader, AiPinnedForecastView, DataFreshnessBar, MarketDecisionLine - opportunity-ai-meta/evidence-summary/v4-decision/v4-risk - HeaderBar, IntradaySignalScene, MapCanvas, PolyWeatherDashboard - ScanFilterPanel, WeatherAuraLayer 修改: - decisionClass 死函数移除 - KoyfinWeatherTerminal → PolyWeatherTerminal - Koyfin-style grid → Multi-panel grid - 欢迎覆盖层 CSS 清理
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