Remove debug prints and unused code

- Remove all debug println statements
- Remove unused service_tracker module
- Remove unused struct fields and methods
- Remove empty placeholder files (cpu.rs, memory.rs, defaults.rs)
- Fix all compiler warnings
- Clean build with zero warnings

Version bump to 0.1.159

agent/src/collectors/backup.rs

@@ -1,5 +1,4 @@
 use async_trait::async_trait;
-use chrono::{NaiveDateTime, DateTime};
 use cm_dashboard_shared::{AgentData, BackupData, BackupDiskData};
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;