Droidspaces

- Change the SELinux context of rootfs.img to `u:object_r:vold_data_file:s0` after formatting to avoid mounting errors in the sparse image installer
- Update the boot script to auto-detect all `.img` files under /data/local/Droidspaces/Containers and set their SELinux context to `u:object_r:vold_data_file:s0`

- If the host is Android and rootfs.img mode is used, set the SELinux context of rootfs.img to `u:object_r:vold_data_file:s0` before mounting to prevent mounting issues

Added custom DNS servers support in the container configuration menu

terminal: upgrade terminal proxy from select to epoll for better performance
mount: harden unmount_rootfs_img with retries and settle time
android: refactor iptables configuration logic into a clean loop
core: harden PID validation and implement shared OS-release parsing
core: implement dynamic container list allocation and use shared OS-release parsing
network: implement multi-DNS support and update CLI options
fix: ensure host-side resource cleanup on container boot failure in rootfs.img mode

Changelog
- Improve rootfs mount and unmount resilience on older kernels like Kernel 4.14 by adding retry logic for image mounting and extra sync calls during unmounting

- Completely re-wrote the sparse image installer and hardened the image integrity verifying process before mounting the created rootfs.img

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Changelog
- fix container restart bug: implement restart marker and early mount detection
- fix: sync and sleep 200ms after repairing the rootfs image AND before mounting the image

- Added "Mask service" option to all 4 stages (Running, Enabled, Disabled, Abnormal) in the Systemd Services menu
- Removed the redundant "Running, Enabled, Disabled..." color legend bar from the top of the Systemd screen

- Implement and integrate cgroup attachment to ensure processes entering containers are correctly placed in the host's cgroup hierarchy for D-Bus/logind functionality and refine container-specific cgroup path creation