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feat(shm): 升级 slotsboxmalloc v0.1.7 (v3) 并适配在线扩容 - #47
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配合已合入并发布的
array2d/slotsboxmalloc#13(v0.1.7, v3 格式)：deps.json中slotsboxmalloc从v0.1.6升至v0.1.7。src/kvspace.c中定义SBO_MIN_SHARD_BYTES (1ULL << 40)，确保kvspace-cSHM 在线扩容所需的单 root 池布局 (root_slots == 1)。sbo_box()改用m->box_off定位 8B 对齐后的sbo_box_t；sbo_head_grow()同步更新m->max_blocks；sbo_data_grow()适配 v3 的child_mask/free_mask/sbo_box_format/sbo_combined/hot_id1缓存与m->slot_shift；tests/test_shm_resize.c中t_bad_root_slots的root_slots偏移更新为 v3sbo_meta_t的 byte 38。ctest（含test_shm_resize的t_data_grow/t_cross_process/t_punch/t_bad_root_slots/t_head_grow）全部通过。