fix: agent acknowledgment recursion and subsystem UI improvements

- Fix recursive call in reportLogWithAck that caused infinite loop
- Add machine binding and security API endpoints
- Enhance AgentScanners component with security status display
- Update scheduler and timeout service reliability
- Remove deprecated install.sh script
- Add subsystem configuration and logging improvements

aggregator-agent/cmd/agent/subsystem_handlers.go

@@ -307,10 +307,12 @@ func handleUpdateAgent(apiClient *client.Client, cfg *config.Config, ackTracker
 
 	// Validate nonce for replay protection
 	log.Printf("[tunturi_ed25519] Validating nonce...")
+	log.Printf("[SECURITY] Nonce validation - UUID: %s, Timestamp: %s", nonceUUIDStr, nonceTimestampStr)
 	if err := validateNonce(nonceUUIDStr, nonceTimestampStr, nonceSignature); err != nil {
+		log.Printf("[SECURITY] ✗ Nonce validation FAILED: %v", err)
 		return fmt.Errorf("[tunturi_ed25519] nonce validation failed: %w", err)
 	}
-	log.Printf("[tunturi_ed25519] ✓ Nonce validated")
+	log.Printf("[SECURITY] ✓ Nonce validated successfully")
 
 	// Record start time for duration calculation
 	updateStartTime := time.Now()