Fix duplicate data by clearing vectors before collection

Collectors now clear their target vectors (tmpfs, drives, pools, services)
before populating to prevent duplicates when updating cached AgentData.

- Clear tmpfs list in memory collector
- Clear drives and pools in disk collector
- Clear services in systemd collector
- Bump version to v0.1.231

agent/src/collectors/systemd.rs

@@ -841,6 +841,9 @@ impl SystemdCollector {
 #[async_trait]
 impl Collector for SystemdCollector {
     async fn collect_structured(&self, agent_data: &mut AgentData) -> Result<(), CollectorError> {
+        // Clear services to prevent duplicates when updating cached data
+        agent_data.services.clear();
+
         // Use cached complete data if available and fresh
         if let Some(cached_complete_services) = self.get_cached_complete_services() {
             for service_data in cached_complete_services {