Implement multi-host autoconnect with consolidated host configuration

- Add DEFAULT_HOSTS constant in config.rs for centralized host management
- Update ZMQ endpoint generation to connect to all configured hosts
- Implement graceful connection handling for unreachable endpoints
- Dashboard now auto-discovers and connects to available agents on cmbox, labbox, simonbox, steambox, srv01

dashboard/src/data/config.rs

@@ -129,10 +129,22 @@ const fn default_tick_rate_ms() -> u64 {
     500
 }
 
+/// Default hosts for auto-discovery
+pub const DEFAULT_HOSTS: &[&str] = &[
+    "cmbox", "labbox", "simonbox", "steambox", "srv01"
+];
+
 fn default_data_source_config() -> DataSourceConfig {
     DataSourceConfig::default()
 }
 
 fn default_zmq_endpoints() -> Vec<String> {
-    vec!["tcp://127.0.0.1:6130".to_string()]
+    // Default endpoints include localhost and all known CMTEC hosts
+    let mut endpoints = vec!["tcp://127.0.0.1:6130".to_string()];
+    
+    for host in DEFAULT_HOSTS {
+        endpoints.push(format!("tcp://{}:6130", host));
+    }
+    
+    endpoints
 }