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/disk.rs

@@ -66,6 +66,10 @@ impl DiskCollector {
 
     /// Collect all storage data and populate AgentData
     async fn collect_storage_data(&self, agent_data: &mut AgentData) -> Result<(), CollectorError> {
+        // Clear drives and pools to prevent duplicates when updating cached data
+        agent_data.system.storage.drives.clear();
+        agent_data.system.storage.pools.clear();
+
         // Step 1: Get mount points and their backing devices
         let mount_devices = self.get_mount_devices().await?;