AdAway (non-root) paused after boot and after freeing memory of Adaway (MIUI 14, Android 13)

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

I use AdAway non-rooted via VPN on a xiaomi redmi note 13 pro+. It works fine, except that it does not automatically start after a reboot (when opening, it's in "pause" mode). Any ideas why not?

I did:

- Selected "Background autostart"
- Set Battery saver to "No restrictions"
- Set Always-on VPN in preferences

Ever since I set the Always-on VPN, I get a message after reboot (before providing the unlock code for the first time): "Disconnected from always-on VPN — Change network or VPN settings".

I can also reproduce this by explicit closing AdAway (showing running apps and swiping it away). This will also pause AdAway.

Thanks for helping, and thanks for Adaway!

### Expected Behavior

I would expect AdAway to stay active, unless explicitly paused through the AdAway UI.

### Steps To Reproduce

Two ways:

1. Reboot
2. Use Android to swipe the AdAway window away (free memory).

### Device Configuration

- AdAway version: 6.1.1
- Ad-blocker mode: VPN
- Device: xiaomi redmi note 13 pro+
- Android version: 13 (MIUI 14)
- Root version: N/A

### Additional context and screenshots

_No response_

Start by reproducing the pause after reboot and after swiping AdAway away on the listed Xiaomi device and Android 13/MIUI 14 configuration, using VPN mode. Trace the Android app entry points involved in boot startup, memory cleanup, and VPN state, then verify that AdAway remains active unless paused through its UI.

Written by the indexing model from the issue text.