🐛 fix: restore Arc import for service initialization

Re-add Arc import that was accidentally removed during clippy warning cleanup.
Services like AttendanceService, AuthenService, ImService, and SearchService
require Arc<Config> for initialization, causing compilation errors when
building with --all-features.

Fixes:
- Arc::new() compilation errors in service initialization
- Enables successful builds with both --no-default-features and --all-features

Author: foxzool

src/client/mod.rs

@@ -1,4 +1,4 @@
-use std::time::Duration;
+use std::{sync::Arc, time::Duration};
 
 use crate::core::{config::Config, constants::AppType};