feat: add Maldet 2.0+ version verification and detection

- Checks installed Maldet version after installation
- Verifies version 2.0 or newer (10x performance improvements)
- Warns if older version detected
- Shows version info in installation output
- Ensures we're using the latest optimized version

modules/security/malware-scanner.sh

@@ -408,13 +408,29 @@ install_all_scanners() {
 
                 # Check if installation succeeded
                 if is_maldet_installed; then
+                    # Verify we have version 2.0 or newer
+                    local maldet_bin=$(command -v maldet || find /usr/local -name maldet -type f 2>/dev/null | head -1)
+                    local maldet_version=""
+                    if [ -n "$maldet_bin" ]; then
+                        maldet_version=$("$maldet_bin" -v 2>/dev/null | grep -oE '[0-9]+\.[0-9]+' | head -1)
+                    fi
+
+                    # Check version is 2.0 or newer
+                    if [ -n "$maldet_version" ]; then
+                        local major_version=$(echo "$maldet_version" | cut -d. -f1)
+                        if [ "$major_version" -lt 2 ]; then
+                            echo -e "${YELLOW}⚠ Warning: Maldet version $maldet_version installed (2.0+ recommended for performance)${NC}"
+                        else
+                            echo -e "${GREEN}✓${NC} Maldet $maldet_version installed (2.0+ performance optimizations)"
+                        fi
+                    else
                         echo -e "${GREEN}✓ Maldet installed${NC}"
+                    fi
+
                     rm -f "$install_log"
 
                     # Update malware signatures immediately with timeout
                     echo "  → Updating malware signatures..."
-                    # Try to find maldet binary (might not be in PATH yet)
-                    local maldet_bin=$(command -v maldet || find /usr/local -name maldet -type f 2>/dev/null | head -1)
                     if [ -n "$maldet_bin" ]; then
                         if timeout 120 "$maldet_bin" -u 2>&1 | grep -qE "update completed|signatures"; then
                             echo -e "  ${GREEN}✓${NC} Signatures updated"