perf(backend): 14 端点缓存+threadpool + N+1 修复 + 性能索引 + system.py 计数 - #43
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PR3 — 后端 API 性能 graph.py（14 端点补缓存 + threadpool，内联 cluster_map 模式）: - overview/bridges/frontier：补 run_in_threadpool（此前 sync+cache 仍阻塞线程池槽） - cocitation-clusters O(N²) 配对：加 300s 缓存 + threadpool - citation-tree/citation-network/topic/similar-via-citation：加 60s 缓存 + threadpool - timeline/quality：加 120s 缓存 + threadpool - weekly_evolution/survey（含 LLM）：加 300s 缓存 + threadpool - research-gaps（最重，2×timeline+2×LLM）：加 600s 缓存 + threadpool - citation-detail/topic_deep_trace/auto_link：含外部 API 副作用，不加缓存（如实标注） N+1 修复: - papers.similar：循环 get_by_id 改 list_by_ids 一次查完 + 按 ids 顺序构建（5-20 次查询→1 次） - topics.list_topics：每主题 2 次查询改 2 次批量聚合（paper_count GROUP BY + 最近 action 按 topic 分组取首条） 性能索引迁移（alembic d4e5f6a7b8c9）: - papers.publication_date 索引（list_paginated 排序/frontier 过滤/年份分组，此前全表扫） - collection_actions.created_at 索引（ORDER BY created_at DESC/每主题最近行动查询） - models.py 对应字段加 index=True 声明 - CREATE INDEX IF NOT EXISTS 幂等（PG/SQLite 通用） system.py: - 拉 200 行 ORM 仅为 len() 改 count_all() 一次 COUNT 查询
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PR3 — 后端 API 性能（中风险）
graph.py（14 端点补缓存 + threadpool）
N+1 修复
性能索引迁移（d4e5f6a7b8c9）
system.py
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