Remove hardcoded discovery interval in systemd collector

- Use config.interval_seconds instead of hardcoded 300 seconds
- Discovery now happens every 10 seconds (configurable) instead of 5 minutes
- Follows configuration-driven architecture requirements

TODO.md

@@ -19,14 +19,14 @@ CPU:
 ● Load: 0.02 0.31 0.86 • 3000.2 MHz
 RAM:
 ● Usage: 33% 2.6GB/7.6GB  
-● /tmp: 0.0% 0B/2.0GB  
+● /tmp: 0% 0B/2.0GB  
 Storage:  
 ● root (Single):  
- ├─ ● nvme0n1 W:4%  
- └─ ● 8.3% 75.0GB/906.2GB
+ ├─ ● nvme0n1 Temp: 40C Wear: 4%  
+ └─ ● 8% 75.0GB/906.2GB
 '''
 
-- Add support to show login users
+- Add support to show login/active users
 - Add support to show timestamp/version for latest nixos rebuild
 
 ## Keyboard navigation and scrolling (dashboard)

agent/src/collectors/systemd.rs

@@ -52,7 +52,7 @@ impl SystemdCollector {
                 monitored_services: Vec::new(),
                 service_status_cache: std::collections::HashMap::new(),
                 last_discovery_time: None,
-                discovery_interval_seconds: 300, // 5 minutes
+                discovery_interval_seconds: config.interval_seconds,
                 nginx_site_metrics: Vec::new(),
                 last_nginx_check_time: None,
                 nginx_check_interval_seconds: 30, // 30 seconds for nginx sites