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/enhance/seq.rs

@@ -85,6 +85,7 @@ pub fn use_seq(seq: SeqMap, mut config: Mapping, field: &str) -> Mapping {
 #[cfg(test)]
 mod tests {
     use super::*;
+    #[allow(unused_imports)]
     use serde_yaml::Value;
 
     #[test]