Clean up unused imports and fix build warnings

- Remove unused imports (Duration, HashMap, SharedError, DateTime, etc.)
- Fix unused variables by prefixing with underscore
- Remove redundant dashboard.toml config file
- Update theme imports to use only needed components
- Maintain all functionality while reducing warnings
- Add srv02 to predefined hosts configuration
- Remove unused broadcast_command methods

dashboard/src/metrics/mod.rs

@@ -1,13 +1,10 @@
 use cm_dashboard_shared::{Metric, Status};
-use std::collections::HashMap;
-use std::time::{Duration, Instant};
-use tracing::{debug, info};
+use std::time::Instant;
 
 pub mod store;
 pub mod subscription;
 
 pub use store::MetricStore;
-pub use subscription::SubscriptionManager;
 
 /// Widget types that can subscribe to metrics
 #[derive(Debug, Clone, Copy, Hash, Eq, PartialEq)]
@@ -21,13 +18,6 @@ pub enum WidgetType {
     Alerts,
 }
 
-/// Metric subscription entry
-#[derive(Debug, Clone)]
-pub struct MetricSubscription {
-    pub widget_type: WidgetType,
-    pub metric_names: Vec<String>,
-}
-
 /// Historical metric data point
 #[derive(Debug, Clone)]
 pub struct MetricDataPoint {