chore: refactor environment variable management in tests by replacing env module with std::env for consistency, and remove unused McpConfig import in main.rs

Author: kaihiroi

src/config.rs

@@ -6,11 +6,7 @@ use figment::{
 use serde::{Deserialize, Serialize};
 use std::path::PathBuf;
 use directories::ProjectDirs;
-use thiserror::Error;
-use toml;
 use log;
-use std::env;
-use std::fs;
 
 // Define a constant for the repository
 pub const GITHUB_REPO_OWNER: &str = "metacontract";
@@ -186,15 +182,15 @@ mod tests {
     use figment::Jail;
 
     fn set_mc_project_root(path: &std::path::Path) -> Option<String> {
-        let old = env::var("MC_PROJECT_ROOT").ok();
-        env::set_var("MC_PROJECT_ROOT", path);
+        let old = std::env::var("MC_PROJECT_ROOT").ok();
+        std::env::set_var("MC_PROJECT_ROOT", path);
         old
     }
     fn restore_mc_project_root(old: Option<String>) {
         if let Some(val) = old {
-            env::set_var("MC_PROJECT_ROOT", val);
+            std::env::set_var("MC_PROJECT_ROOT", val);
         } else {
-            env::remove_var("MC_PROJECT_ROOT");
+            std::env::remove_var("MC_PROJECT_ROOT");
         }
     }
 

src/main.rs

@@ -18,7 +18,7 @@ use tokio::{
 
 // Import specific items needed in main
 use mc_mcp::config; // Keep for config loading
-use mc_mcp::config::McpConfig; // Keep for config type
+// use mc_mcp::config::McpConfig; // unused, remove
 use mc_mcp::initialization::initialize_background_services; // Use new initialization module
 use mc_mcp::server::handler::MyHandler; // Use new handler module