Фикс: бэкграунд звонки — аудио, имя на CallKit, deactivation order, UUID race

Rosetta/Core/Network/Protocol/ProtocolManager.swift

@@ -243,11 +243,14 @@ final class ProtocolManager: @unchecked Sendable {
     /// Keeps the process alive during active calls so WebSocket survives brief background.
     func beginCallBackgroundTask() {
         guard callBackgroundTask == .invalid else { return }
+        let remaining = UIApplication.shared.backgroundTimeRemaining
+        Self.logger.info("📞 Background task starting — remaining=\(remaining, privacy: .public)s wsState=\(String(describing: self.connectionState), privacy: .public)")
         callBackgroundTask = UIApplication.shared.beginBackgroundTask(withName: "RosettaCall") { [weak self] in
             // Don't end the call here — CallKit keeps the process alive for active calls.
             // This background task only buys time for WebSocket reconnection.
             // Killing the call on expiry was causing premature call termination
             // during keyExchange phase (~30s before Desktop could respond).
+            Self.logger.info("📞 Background task EXPIRED — OS reclaiming")
             self?.endCallBackgroundTask()
         }
         Self.logger.info("📞 Background task started for call")