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P-016: 将EffectManager的ShowNarrative/HideNarrative/ShowPickupNotification 从日志占位改为真实CreateWidget+AddToViewport+淡入淡出生命周期。 - 新增UPickupNotificationWidget C++基类(对称NarrativeTextWidget) - EffectManager新增SetWidgetClasses注入接口与Widget弱引用缓存 - PerformCleanup补齐Narrative/Pickup Widget兜底淡出移除 - ASystemDriver新增两个TSubclassOf配置点,BeginPlay注入给EffectManager - Widget Class未注入时回退日志占位,保证Effect流程不卡 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>