refactor: improve network interface validation

Add context parameter to validInterfacesMap for better error handling and
logging. Move Windows-specific network adapter validation logic to the
ctrld package. Key changes include:

- Add context parameter to validInterfacesMap across all platforms
- Move Windows validInterfaces to ctrld.ValidInterfaces
- Improve error handling for virtual interface detection on Linux
- Update all callers to pass appropriate context

This change improves error reporting and makes the interface validation
code more maintainable across different platforms.

cmd/cli/net_darwin.go

@@ -3,6 +3,7 @@ package cli
 import (
 	"bufio"
 	"bytes"
+	"context"
 	"io"
 	"net"
 	"os/exec"
@@ -51,7 +52,7 @@ func validInterface(iface *net.Interface, validIfacesMap map[string]struct{}) bo
 }
 
 // validInterfacesMap returns a set of all valid hardware ports.
-func validInterfacesMap() map[string]struct{} {
+func validInterfacesMap(ctx context.Context) map[string]struct{} {
 	b, err := exec.Command("networksetup", "-listallhardwareports").Output()
 	if err != nil {
 		return nil