Fix storage display issues and use dynamic versioning

Phase 1 fixes for storage display:
- Replace findmnt with lsblk to eliminate bind mount issues (/nix/store)
- Add sudo to smartctl commands for permission access
- Fix NVMe SMART parsing for Temperature: and Percentage Used: fields
- Use dynamic version from CARGO_PKG_VERSION instead of hardcoded strings

Storage display should now show correct mount points and temperature/wear.
Status evaluation and notifications still need restoration in subsequent phases.

agent/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard-agent"
-version = "0.1.139"
+version = "0.1.140"
 edition = "2021"
 
 [dependencies]