perf: art_scan 先下降到前缀覆盖节点再扫子树（kvlang #267） - #21
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art_scan 从 art_root 整树 DFS 改为沿 pfx 下降到覆盖节点再扫子树。 List/DelTree/CpTree 均经 List，一处修改全线受益。 before/after（同一机器、同一 bench）： List(/t/) ×400，噪声 /n/** 1000→8000 before 0.0066s → 0.0518s (7.87×，跟全树线性) after 0.0001s → 0.0001s (~1.0×) DelTree 小帧 /d/f，旁挂 8000 个 /lib key，200 次 before ~900 µs/次 after ~70 µs/次 (13.5×) callgrind 同 DelTree bench art_scan self 26.6% → 0.003% Deltree inclusive 41.8% → 0.40% kvlang shm 墙钟（master + v0.2.12 前端，只换 backend） fib(16) 2.11s → 0.42s (5.1×) fib(18) 6.36s → 1.00s (6.3×) nqueens(6) 0.38s → 0.09s (4.2×) binary_search(200) 0.51s → 0.17s (3.0×)
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art_scan从整树根全扫改为下降到前缀子树。List / DelTree / CpTree 全线受益。kvlang #267