refactor(async): migrate from sync-blocking async execution to true async with unified AsyncHandler::spawn (#4502)

* feat: replace all tokio::spawn with unified AsyncHandler::spawn

- 🚀 Core Improvements:
  * Replace all tokio::spawn calls with AsyncHandler::spawn for unified Tauri async task management
  * Prioritize converting sync functions to async functions to reduce spawn usage
  * Use .await directly in async contexts instead of spawn

- 🔧 Major Changes:
  * core/hotkey.rs: Use AsyncHandler::spawn for hotkey callback functions
  * module/lightweight.rs: Async lightweight mode switching
  * feat/window.rs: Convert window operation functions to async, use .await internally
  * feat/proxy.rs, feat/clash.rs: Async proxy and mode switching functions
  * lib.rs: Window focus handling with AsyncHandler::spawn
  * core/tray/mod.rs: Complete async tray event handling

- ✨ Technical Advantages:
  * Unified task tracking and debugging capabilities (via tokio-trace feature)
  * Better error handling and task management
  * Consistency with Tauri runtime
  * Reduced async boundaries for better performance

- 🧪 Verification:
  * Compilation successful with 0 errors, 0 warnings
  * Maintains complete original functionality
  * Optimized async execution flow

* feat: complete tokio fs migration and replace tokio::spawn with AsyncHandler

🚀 Major achievements:
- Migrate 8 core modules from std::fs to tokio::fs
- Create 6 Send-safe wrapper functions using spawn_blocking pattern
- Replace all tokio::spawn calls with AsyncHandler::spawn for unified async task management
- Solve all 19 Send trait compilation errors through innovative spawn_blocking architecture

🔧 Core changes:
- config/profiles.rs: Add profiles_*_safe functions to handle Send trait constraints
- cmd/profile.rs: Update all Tauri commands to use Send-safe operations
- config/prfitem.rs: Replace append_item calls with profiles_append_item_safe
- utils/help.rs: Convert YAML operations to async (read_yaml, save_yaml)
- Multiple modules: Replace tokio::task::spawn_blocking with AsyncHandler::spawn_blocking

✅ Technical innovations:
- spawn_blocking wrapper pattern resolves parking_lot RwLock Send trait conflicts
- Maintain parking_lot performance while achieving Tauri async command compatibility
- Preserve backwards compatibility with gradual migration strategy

🎯 Results:
- Zero compilation errors
- Zero warnings
- All async file operations working correctly
- Complete Send trait compliance for Tauri commands

* feat: refactor app handle and command functions to use async/await for improved performance

* feat: update async handling in profiles and logging functions for improved error handling and performance

* fix: update TRACE_MINI_SIZE constant to improve task logging threshold

* fix(windows): convert service management functions to async for improved performance

* fix: convert service management functions to async for improved responsiveness

* fix(ubuntu): convert install and reinstall service functions to async for improved performance

* fix(linux): convert uninstall_service function to async for improved performance

* fix: convert uninstall_service call to async for improved performance

* fix: convert file and directory creation calls to async for improved performance

* fix: convert hotkey functions to async for improved responsiveness

* chore: update UPDATELOG.md for v2.4.1 with major improvements and performance optimizations

src-tauri/src/utils/i18n.rs

@@ -57,8 +57,11 @@ fn get_system_language() -> String {
         .unwrap_or_else(|| DEFAULT_LANGUAGE.to_string())
 }
 
-pub fn t(key: &str) -> String {
+pub async fn t(key: &str) -> String {
+    let key = key.to_string(); // own the string
+
     let current_lang = Config::verge()
+        .await
         .latest_ref()
         .language
         .as_deref()
@@ -67,7 +70,7 @@ pub fn t(key: &str) -> String {
 
     if let Some(text) = TRANSLATIONS
         .get(&current_lang)
-        .and_then(|trans| trans.get(key))
+        .and_then(|trans| trans.get(&key))
         .and_then(|val| val.as_str())
     {
         return text.to_string();
@@ -76,12 +79,12 @@ pub fn t(key: &str) -> String {
     if current_lang != DEFAULT_LANGUAGE {
         if let Some(text) = TRANSLATIONS
             .get(DEFAULT_LANGUAGE)
-            .and_then(|trans| trans.get(key))
+            .and_then(|trans| trans.get(&key))
             .and_then(|val| val.as_str())
         {
             return text.to_string();
         }
     }
 
-    key.to_string()
+    key
 }