Adds a use-it-or-lose-it scheduling strategy: prefer accounts whose
session window resets soonest, so near-reset accounts get drained first
instead of accounts whose reset is still far away.
Both schedulers, opt-in, default behavior unchanged:
- Anthropic (gateway_service.go): new GatewaySchedulingConfig
.PreferSoonestReset flag. When on, the layered load-aware selection
inserts a filterBySoonestReset stage (priority -> soonest-reset ->
load -> LRU). Accounts with no active SessionWindowEnd are treated as
lowest priority; ties fall through to LRU.
- OpenAI/Codex (openai_account_scheduler.go): new "reset" score weight
in GatewayOpenAIWSSchedulerScoreWeights. Soonest-reset accounts score
higher; weight defaults to 0 (no effect).
SessionWindowEnd (upstream 5h/quota ResetsAt) is already carried in the
scheduler snapshot, so no snapshot changes are needed.
Documented in deploy/config.example.yaml. Adds unit tests for the
Anthropic filter and the OpenAI reset factor.
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