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-server/internal/config/config.go

@@ -88,6 +88,14 @@ func Load() (*Config, error) {
 	cfg.Timezone = getEnv("TIMEZONE", "UTC")
 	cfg.LatestAgentVersion = getEnv("LATEST_AGENT_VERSION", "0.1.22")
 	cfg.MinAgentVersion = getEnv("MIN_AGENT_VERSION", "0.1.22")
+	cfg.SigningPrivateKey = getEnv("REDFLAG_SIGNING_PRIVATE_KEY", "")
+
+	// Debug: Log signing key status
+	if cfg.SigningPrivateKey != "" {
+		fmt.Printf("[CONFIG] ✅ Ed25519 signing private key configured (%d characters)\n", len(cfg.SigningPrivateKey))
+	} else {
+		fmt.Printf("[CONFIG] ❌ No Ed25519 signing private key found in REDFLAG_SIGNING_PRIVATE_KEY\n")
+	}
 
 	// Handle missing secrets
 	if cfg.Admin.Password == "" || cfg.Admin.JWTSecret == "" || cfg.Database.Password == "" {