perf(core): replace BTreeMap with DashMap in MemTable for concurrent access#382
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…access MEM-MEMTABLE-002: MemTable previously used BTreeMap for sorted key storage, which serialized all access. Replaced with dashmap::DashMap, a shard-based concurrent hashmap that allows lock-free reads and writes to different keys. - DashMap provides O(1) average access vs BTreeMap's O(log n) - Iteration now requires sorting snapshot (for SSTable flush and scan) - Engine: flush_memtable_impl sorts entries before SSTable build - MemTableIterator: now uses owned sorted snapshot (no lifetime issues like crossbeam-skiplist) - TableIterator: KeyType changed to Vec<u8> for compatibility Closes #367
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Closes #367