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

Cargo.lock

@@ -279,7 +279,7 @@ checksum = "a1d728cc89cf3aee9ff92b05e62b19ee65a02b5702cff7d5a377e32c6ae29d8d"
 
 [[package]]
 name = "cm-dashboard"
-version = "0.1.158"
+version = "0.1.159"
 dependencies = [
  "anyhow",
  "chrono",
@@ -301,7 +301,7 @@ dependencies = [
 
 [[package]]
 name = "cm-dashboard-agent"
-version = "0.1.158"
+version = "0.1.159"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -324,7 +324,7 @@ dependencies = [
 
 [[package]]
 name = "cm-dashboard-shared"
-version = "0.1.158"
+version = "0.1.159"
 dependencies = [
  "chrono",
  "serde",