perf: utilize smartstring for string handling (#5149)

* perf: utilize smartstring for string handling

- Updated various modules to replace standard String with smartstring::alias::String for improved performance and memory efficiency.
- Adjusted string manipulations and conversions throughout the codebase to ensure compatibility with the new smartstring type.
- Enhanced readability and maintainability by using `.into()` for conversions where applicable.
- Ensured that all instances of string handling in configuration, logging, and network management leverage the benefits of smartstring.

* fix: replace wrap_err with stringify_err for better error handling in UWP tool invocation

* refactor: update import path for StringifyErr and adjust string handling in sysopt

* fix: correct import path for CmdResult in UWP module

* fix: update argument type for execute_sysproxy_command to use std::string::String

* fix: add missing CmdResult import in UWP platform module

* fix: improve string handling and error messaging across multiple files

* style: format code for improved readability and consistency across multiple files

* fix: remove unused file

src-tauri/src/config/verge.rs

@@ -6,6 +6,7 @@ use crate::{
 use anyhow::Result;
 use log::LevelFilter;
 use serde::{Deserialize, Serialize};
+use smartstring::alias::String;
 
 /// ### `verge.yaml` schema
 #[derive(Default, Debug, Clone, Deserialize, Serialize)]
@@ -322,7 +323,7 @@ impl IVerge {
 
     fn get_system_language() -> String {
         let sys_lang = sys_locale::get_locale()
-            .unwrap_or_else(|| String::from("en"))
+            .unwrap_or_else(|| "en".into())
             .to_lowercase();
 
         let lang_code = sys_lang.split(['_', '-']).next().unwrap_or("en");