Complete disk collector rewrite with clean architecture

Replaced complex disk collector with simple lsblk → df → group workflow.
Supports both physical drives and mergerfs pools with unified metrics.
Eliminates configuration complexity through pure auto-discovery.

- Clean discovery pipeline using lsblk and df commands
- Physical drive grouping with filesystem children
- MergerFS pool detection with parity heuristics
- Unified metric generation for consistent dashboard display
- SMART data collection for temperature, wear, and health

Cargo.lock

@@ -279,7 +279,7 @@ checksum = "a1d728cc89cf3aee9ff92b05e62b19ee65a02b5702cff7d5a377e32c6ae29d8d"
 
 [[package]]
 name = "cm-dashboard"
-version = "0.1.108"
+version = "0.1.109"
 dependencies = [
  "anyhow",
  "chrono",
@@ -301,7 +301,7 @@ dependencies = [
 
 [[package]]
 name = "cm-dashboard-agent"
-version = "0.1.108"
+version = "0.1.109"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -324,7 +324,7 @@ dependencies = [
 
 [[package]]
 name = "cm-dashboard-shared"
-version = "0.1.108"
+version = "0.1.109"
 dependencies = [
  "chrono",
  "serde",