feat(asb): buffer quote construction

[binarybaron]

Note

Medium Risk
Changes the quote request/response flow in the ASB event loop by batching concurrent quote requests behind a single in-flight computation, which could affect responsiveness and failure behavior under load if the queue grows or the computation stalls.

Overview
Buffers and coalesces quote responses: OutEvent::QuoteRequested no longer computes/sends a quote per request; it now queues response channels and triggers at most one in-flight quote computation, replying to all pending requests when it resolves (falling back to BidQuote::ZERO on error).

Refactors make_quote_or_use_cached to return a 'static boxed future (cloning needed dependencies) so quote computation can be stored/polled asynchronously in the tokio::select! loop without blocking other event processing.

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@Einliterflasche Please review.

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