I rewrote the router's boundary management part to implement dynamic management
from a high-level box interface. This also includes a number of changes I made
in the process of rewriting some messy parts, such as the Outbound tree
bottom-top starter.
The `process_path` rule of sing-box is inherited from Clash,
the original code uses the local system's path format (e.g. `\Device\HarddiskVolume1\folder\program.exe`),
but when the device has multiple disks, the HarddiskVolume serial number is not stable.
This change make QueryFullProcessImageNameW output a Win32 path (such as `C:\folder\program.exe`),
which will disrupt the existing `process_path` use cases in Windows.