* 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
- Honor Freedesktop precedence when locating mimeapps.list
- Replace per-scheme HashSet with index-tracking HashMap
- Merge duplicate handler entries instead of discarding them
- Ensure all schemes exist using the new tracking structure
- add retry path that restarts Mihomo on connection-related reload errors
- guard runtime config state by discarding on repeated failures and returning rich errors
* feat: local backup
* refactor(backup): make local backup helpers synchronous and clean up redundant checks
- Converted local backup helpers to synchronous functions to remove unused async warnings and align command signatures.
- Updated list/delete/export commands to call the sync feature functions directly without awaits while preserving behavior.
- Simplified destination directory creation to always ensure parent folders exist without redundant checks, satisfying Clippy.
* feat: add Clippy alias commands and improve build process for Clippy integration
* fix(lint-clippy): update Clippy run command to use working directory for src-tauri
* fix: specify type for mode and host variables to improve clarity and type safety
* fix: specify types for pac_url and host variables to enhance type safety
* fix: change type of pac_url from Url to String for consistency in handling PAC output
