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Zhengchao An
2a8be5566d
ForegroundPressure had two definitions with byte-identical pressure computation: one in ecstore data-movement backpressure and one in the heal manager queue. That duplication is a violation of the ARCHITECTURE.md invariant that each type has exactly one definition, and it means any future change to the utilization math has to land twice. Add the canonical `ForegroundPressure` and a `foreground_pressure(snapshot, read_threshold_pct, write_threshold_pct)` function to `crates/concurrency/src/workload.rs`, which already owns `WorkloadClass`, `AdmissionState`, and the admission snapshot contract. Both existing consumers already depend on `rustfs-concurrency`, so no crate edge is added. The filter_map pipeline is transferred verbatim, preserving all five boundary behaviors (zero threshold, zero limit, missing entry, missing active count, and the `Saturated` full-utilization special case), the mul-before-div percentage normalization, the `>=` threshold comparison, and the read-then-write ordering that makes `max_by_key` break utilization ties toward the write class. The enable switch is deliberately left out: ecstore gates on `config.enabled` while heal gates on `mainline_throttle_enable` plus a both-thresholds-zero check, so each call site keeps its own condition. This is the expand step only. The ecstore and heal copies are untouched and are removed by the follow-up migrate task. Refs rustfs/backlog#2047