Implement proper storage metrics (P0-009)\n\n- Add dedicated storage_metrics table\n- Create StorageMetricReport models with proper field names\n- Add ReportStorageMetrics to agent client\n- Update storage scanner to use new method\n- Implement server-side handlers and queries\n- Register new routes and update UI\n- Remove legacy Scan() method\n- Follow ETHOS principles: honest naming, clean architecture

aggregator-agent/internal/common/agentfile.go

@@ -31,7 +31,7 @@ func CalculateChecksum(filePath string) (string, error) {
 // IsRequiredFile determines if a file is required for agent operation
 func IsRequiredFile(path string) bool {
 	requiredFiles := []string{
-		"/etc/redflag/config.json",
+		"/etc/redflag/agent/config.json",  // Agent config in nested structure
 		"/usr/local/bin/redflag-agent",
 		"/etc/systemd/system/redflag-agent.service",
 	}