High CPU load prevention: cancellation safety for AsyncReceiver

[bvscd]

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[Copilot]

Pull request overview

This PR addresses high CPU load prevention by implementing cancellation-safe counter management in AsyncReceiver. The changes ensure that when async tasks are cancelled while awaiting, internal state is properly maintained to prevent busy-waiting loops that consume excessive CPU.

Changes:

• Introduces SyncGuard struct to provide RAII-based cancellation-safe counter management that decrements even when futures are dropped
• Modifies AsyncReceiver::pop() to use the guard instead of manual fetch_add/fetch_sub calls
• Moves stats recording in QuicNode::query() to after successful query completion to only record completed queries

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/adnl/src/adnl/common.rs	Adds SyncGuard struct and updates AsyncReceiver::pop() to use it for cancellation safety
src/adnl/src/quic/mod.rs	Moves msg_stats.record() to after successful query response

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