39768ff598
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根因: SqliteStorage.find() 对 CJK 查询使用 LIKE fallback 获取候选， 但 TF-IDF 评分因 unicode61 tokenizer 不支持 CJK 而系统性地偏低， 被默认 min_similarity=0.7 阈值全部过滤掉。 修复: 检测到 CJK 查询时将阈值降至 50%（0.35），避免所有记忆被误过滤。