BandwidthManager

Schedules bandwidth fairly across competing consumers. This is a pure-Kotlin port of libtorrent's bandwidth_manager (aux_/bandwidth_manager.hpp, bandwidth_manager.cpp).

There is one manager per direction (channel is upload or download). Consumers call requestBandwidth; if their channels have quota banked the request is granted immediately, otherwise it joins queueSize and is serviced over subsequent updateQuotas rounds. Each round refills every involved BandwidthChannel's token bucket, splits the available quota in proportion to request priorities, and dispatches finished requests through BandwidthSocket.assignBandwidth.

This is the pure scheduling algorithm: the only outside interaction is the BandwidthSocket callback, so it ports without any I/O or timers. The driver decides when to call updateQuotas and with what elapsed time.

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