perf(netflow-db): compute a scope's MAAD measures together and in parallel

Each scoped address set now runs one shared prefix walk for addresses, packets and bytes, falling back to separate walks only when a weighted measure has zero-weight addresses. The MAAD pool grows from 2 workers to the available parallelism, capped at 8. Rollup merges no longer reserve capacity for every child entry.

On one uoregon day the stored tables are identical to the previous build.
4595418c06flamboh committed on 9/26/2026, 11:18:02 PMparent2dd7548
2 files changedLine totals unavailable