fix: Implement Maldet-only filtering when MALDET_ONLY environment variable is set

- Add filter logic to detect MALDET_ONLY=1 and restrict AVAILABLE_SCANNERS to Maldet only
- Verify Maldet is actually installed before filtering
- Show clear message when running in Maldet-only mode
- Prevents unintended multi-scanner scans when user selects Maldet menu option

modules/security/malware-scanner.sh

@@ -1144,6 +1144,22 @@ else
     fi
 fi
 
+# Filter scanners if MALDET_ONLY is set (for Maldet-specific menu)
+if [ "${MALDET_ONLY:-0}" = "1" ]; then
+    log_message "Maldet-only mode enabled"
+    echo "🔍 Running Maldet-only scan (fastest, Linux-focused)"
+    echo ""
+    # Check if Maldet is available
+    if [[ " ${AVAILABLE_SCANNERS[@]} " =~ " maldet " ]]; then
+        AVAILABLE_SCANNERS=("maldet")
+        log_message "Filtered to Maldet only"
+    else
+        log_message "ERROR: Maldet not installed but MALDET_ONLY was set"
+        echo -e "${RED}ERROR: Maldet is not installed${NC}"
+        exit 1
+    fi
+fi
+
 # If no scanners found, show installation guide and exit gracefully
 if [ ${#AVAILABLE_SCANNERS[@]} -eq 0 ]; then
     log_message "WARNING: No scanners found on this system"