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/model/api/common.rs

@@ -0,0 +1,20 @@
+use reqwest::Client;
+
+#[allow(unused)]
+pub(crate) struct ApiCaller<'a> {
+    pub(crate) url: &'a str,
+    pub(crate) client: Client,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_api_caller() {
+        let _api_caller = ApiCaller {
+            url: "https://example.com",
+            client: Client::new(),
+        };
+    }
+}

src-tauri/src/model/api/mihomo.rs

@@ -0,0 +1,5 @@
+use super::common::ApiCaller;
+
+pub struct MihomoAPICaller {
+    pub(crate) caller: ApiCaller<'static>,
+}

src-tauri/src/model/api/mod.rs

@@ -0,0 +1,2 @@
+pub mod common;
+pub mod mihomo;

src-tauri/src/model/mod.rs

@@ -1 +1,2 @@
-pub mod sysinfo;
+pub mod api;
+pub mod sysinfo;