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13adc6fa78
Enhance signal handling to support proper daemon operation: - SIGTERM: Graceful shutdown (same behavior as SIGINT) - SIGQUIT: Graceful shutdown with full statistics dump - SIGUSR1: Log rotation acknowledgment for external tools - SIGUSR2: Dump runtime status to log without stopping Statistics dump includes connection counts, ME keepalive metrics, and relay adaptive tuning counters. SIGHUP config reload unchanged (handled in hot_reload.rs). Signals are handled via tokio::signal::unix with async select! to avoid blocking the runtime. Non-shutdown signals (USR1/USR2) run in a background task spawned at startup. Signed-off-by: Vladimir Krivopalov <argenet@yandex.ru>