Move C-state name cleaning to agent for smaller JSON

- Agent now extracts "C" + digits pattern (C3, C10) using char parsing
- Removes suffixes like "_ACPI", "_MWAIT" at source
- Reduces JSON payload size over ZMQ
- No regex dependency - uses fast char iteration (~1μs overhead)
- Robust fallback to original name if pattern not found
- Dashboard simplified to use clean names directly

Bump version to v0.1.212

Co-Authored-By: Claude <noreply@anthropic.com>

dashboard/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard"
-version = "0.1.211"
+version = "0.1.212"
 edition = "2021"
 
 [dependencies]