Handle launch intent nullability and PendingIntent flags

[Autfy]

Motivation

• Prevent crashes when the demo attempts to start an app with no available launch Intent and make the foreground PendingIntent compatible with modern Android immutability requirements.

Description

• In WaitAppAction.run guard the call to packageManager.getLaunchIntentForPackage(targetApp) and show toast("未找到应用: $targetApp") and return if the launch intent is null before calling startActivity.
• In ForegroundService.getNotification compute pendingFlags using PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE on Build.VERSION_CODES.M and fall back to PendingIntent.FLAG_UPDATE_CURRENT on older versions, then pass pendingFlags into PendingIntent.getService.

Testing

• No automated tests were run.

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Codex Task