perf: fix slow /packets?groupByHash=true on large stores#2

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efiten wants to merge 3 commits into

fix/grouped-packets-perf

Commits on Apr 1, 2026

perf: eliminate O(n*obs) scan and cache sort in QueryGroupedPackets

efiten
and
claude
committed
perf: cache GetChannels and move JSON unmarshal outside read lock

efiten
and
claude
committed
test: add tests for LatestSeen maintenance, grouped packet sort, and channel cache

efiten
and
claude
committed