refactor: move business logic into app

* also move all at directory root crate

* all actors are into lib directory

* formatter is into system_monitor now

src/app/service.rs

@@ -0,0 +1,38 @@
+use discord_client::DiscordNotifier;
+use system_monitor::{SystemMonitor, alert_formatter::AlertFormatter};
+pub struct Service {
+    notifier: DiscordNotifier,
+    monitor: SystemMonitor,
+    formatter: AlertFormatter,
+}
+
+pub fn new(
+    notifier: DiscordNotifier,
+    monitor: SystemMonitor,
+    formatter: AlertFormatter,
+) -> Service {
+    Service {
+        notifier,
+        monitor,
+        formatter,
+    }
+}
+
+impl Service {
+    pub fn run(&self) {
+        // Check for threshold violations and send alerts
+        let violations = self.monitor.check_thresholds();
+        for violation in violations {
+            let message = self.formatter.format_violation(&violation);
+            self.notifier
+                .send_notification(&message)
+                .expect("Failed to send notification");
+        }
+
+        // Send a final notification with all system information
+        let summary = self.formatter.format_summary(&self.monitor);
+        self.notifier
+            .send_notification(&summary)
+            .expect("Failed to send final notification");
+    }
+}