Add new proxy.rs module with get_proxies and get_providers_proxies commands.
Update mod.rs and lib.rs to re-export and register proxy commands.
Update API.ts to use invoke for proxy commands.
Minor formatting improvements in module/mihomo.rs.
• Introduce new API caller implementations for Mihomo in model and module layers.
• Add configuration and API integration files under /src-tauri/src/config/api and /src-tauri/src/model/api.
• Implement a singleton MihomoAPICaller with async API call support and integration tests.
• Create a new MihomoManager module to refresh and fetch proxies from the API.
• Update Cargo.lock and Cargo.toml with additional dependencies (async-trait, env_logger, mockito, tempfile, etc.) related to the Mihomo API support.
