fix: enhance security validations, complete English translations, and fix punctuation

[agostino-code]

Summary of Changes

1. Security Enhancements

• Path Traversal & Control Character Validation:
  • src-tauri/src/management_api.rs: Enforced strict checks on path parameters and file names against directory traversal sequences (..), null bytes, and control characters.
  • src-tauri/src/oauth_browser.rs & src-tauri/src/core_config/aliases.rs: Added URI scheme and control character validation for browser launch and external URL opening.
• Upload File Size Limiting:
  • Enforced a 10 MB payload limit for auth credential files on both backend (management_api.rs) and client-side (managementApi.ts).
• Dev Server Loopback Binding:
  • package.json: Updated Vite dev command to bind strictly to 127.0.0.1 instead of