fix: WireGuard client improvements

- Updated WireGuard client to use `wg-quick` instead of `sudo wg-quick`.
- Improved error handling in WireGuard client.
- Added `sudo` to `wg show` command for proper permissions.
- Updated example `wireguard.vsh` script to reflect changes.
- Added a new `wg0.conf` file for the WireGuard configuration.
- Resolved the issue where the script wasn't finding the configuration file.

Co-authored-by: mahmmoud.hassanein <mahmmoud.hassanein@gmail.com>

lib/clients/wireguard/client.v

@@ -30,7 +30,7 @@ pub mut:
 }
 
 pub fn (wg WireGuard) show() !WGShow {
-	cmd := 'wg show'
+	cmd := 'sudo wg show'
 	res := os.execute(cmd)
 	if res.exit_code != 0 {
 		return error('failed to execute show command due to: ${res.output}')
@@ -60,12 +60,11 @@ pub:
 }
 
 pub fn (wg WireGuard) start(args StartArgs) ! {
-	if os.exists(args.config_file_path) {
+	if !os.exists(args.config_file_path) {
 		return error('File ${args.config_file_path} does not exists.')
 	}
 
-	cmd := 'sudo wg-quick up ${args.config_file_path}'
-	println('cmd: ${cmd}')
+	cmd := 'wg-quick up ${args.config_file_path}'
 	res := os.execute(cmd)
 	if res.exit_code != 0 {
 		return error('failed to execute start command due to: ${res.output}')
@@ -79,11 +78,11 @@ pub:
 }
 
 pub fn (wg WireGuard) down(args DownArgs) ! {
-	if os.exists(args.config_file_path) {
+	if !os.exists(args.config_file_path) {
 		return error('File ${args.config_file_path} does not exists.')
 	}
 
-	cmd := 'sudo wg-quick down ${args.config_file_path}'
+	cmd := 'wg-quick down ${args.config_file_path}'
 	res := os.execute(cmd)
 	if res.exit_code != 0 {
 		return error('failed to execute down command due to: ${res.output}')

lib/clients/wireguard/wireguard_factory_.v

@@ -28,23 +28,17 @@ fn args_get(args_ ArgsGet) ArgsGet {
 }
 
 pub fn get(args_ ArgsGet) !&WireGuard {
-	println('Before the args get')
 	mut args := args_get(args_)
-	println('Before the bigger if')
 	if args.name !in wireguard_global {
-		println('Before the if connd')
 		if args.name == 'wireguard' {
-			println('Before saving')
 			if !config_exists(args) {
 				if default {
 					println('When saving')
 					config_save(args)!
 				}
 			}
-			println('When loading')
 			config_load(args)!
 		}
-		println('After all')
 	}
 	return wireguard_global[args.name] or {
 		println(wireguard_global)