Fix security issues, clean Rust warnings, restore UTF-8 locales, and improve account UX/performance

[Vucius]

Overview

This PR focuses on eliminating compiler warnings, improving backend security, fixing locale encoding/formatting issues, and optimizing frontend performance and user experience (UX) during account operations.

Key Changes

1. Security & Backend Fixes

• Path Traversal Prevention: Exposed validate_user_json_path in src-tauri/src/commands/mod.rs and integrated it into log export commands (export_proxy_logs and export_proxy_logs_json in proxy.rs) to validate target file paths before writing files.
• Refactoring Fixes: Removed redundant braces left behind during a previous refactoring in src-tauri/src/modules/account.rs.
• User Tips Update: Updated startup hints in src-tauri/src/lib.rs to suggest viewing gui_config.json or environment variables instead of searching Docker logs.

2. Rust Warning Cleanups

Addressed numerous compiler warnings to improve code health and build output readability:

• Unused Imports & Dead Code: Removed unused imports (e.g., in cloudflared.rs, config.rs, user_token_db.rs, retry.rs) and tagged unused helper functions with #[allow(dead_code)] (e.g., in security_db.rs, scheduler.rs, version.rs, crypto.rs, http.rs).
• Unused Variables: Prefixed unused variables with an underscore (e.g., _sid, _rx, _tx, _result, _entry, _timeout_secs) across mapping and token management modules.
• OS-Specific Scoping: Scoped Windows-specific code blocks using #![cfg(target_os = "windows")] in src-tauri/src/utils/command.rs and localized process dependencies in src-tauri/src/modules/integration.rs.

3. Frontend & UX Optimizations

• Parallel Fetching: Optimized switchAccount in src/stores/useAccountStore.ts to retrieve the current account and all accounts in parallel (Promise.all), reducing load times.
• Non-Blocking Quota Refresh: Implemented a background quota refresh after switching accounts, avoiding unnecessary UI blocking loaders.
• Vite Build Warning Silence: Raised the Vite chunk size warning limit to 1500kB in vite.config.ts to clean up compilation build warnings.

4. Locales & Encoding Fixes

• UTF-8 Restored: Restored UTF-8 encoding across multiple localization files under src/locales/ (including zh.json, zh-TW.json, en.json, and others) to fix TypeScript compilation string literal syntax errors (TS1002).