L1
UI Layer · 用户界面
MasonryGrid / InputCard / 6 cards
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L2
Card Registry · 卡片注册表
type → Component, self-register
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L3
Content Detection · 内容检测器
priority queue, multi-signal scoring
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L4
Data Repository · 数据访问层
CardRepository interface, swappable
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L5
Backend Service · alcove-agent
External API · Cache · Anti-scraping