feat: add Mihomo API modules and manager (#2869)

• 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.

src-tauri/src/config/mod.rs

@@ -21,3 +21,6 @@ pub const DEFAULT_PAC: &str = r#"function FindProxyForURL(url, host) {
   return "PROXY 127.0.0.1:%mixed-port%; SOCKS5 127.0.0.1:%mixed-port%; DIRECT;";
 }
 "#;
+
+
+pub mod api;