CRITICAL FIX: Make Maldet installation non-fatal - continue if installation fails

FIXED:
- Wrapped Maldet installation in subshell with '|| true' error handling
- Changed return 1 to return 0 in Maldet installation checks
- Allows installation to continue to RKHunter/ImunifyAV even if Maldet fails
- Changed all Plesk diagnostic returns to just continue

BEHAVIOR CHANGE:
- Before: One scanner failure → entire installation stops with exit code 1
- After: One scanner failure → shows error but continues to next scanner
- User gets all successfully installed scanners even if some fail

This ensures that if Maldet fails to install (e.g., file not created despite
successful installation script), the user can still get ClamAV, ImunifyAV,
and RKHunter installed instead of failing completely.

modules/security/malware-scanner.sh

@@ -260,6 +260,7 @@ install_all_scanners() {
     if ! is_maldet_installed; then
         echo -e "${CYAN}[2/4] Installing Maldet...${NC}"
 
+        (
             cd /tmp || { echo -e "${RED}✗ Cannot access /tmp${NC}"; return 1; }
 
             # Download Maldet
@@ -281,8 +282,6 @@ install_all_scanners() {
                 local maldet_dir=$(find /tmp -maxdepth 1 -type d -name "maldetect-*" 2>/dev/null | head -1)
                 if [ -z "$maldet_dir" ]; then
                     echo -e "${RED}✗ Cannot find extracted directory${NC}"
-                echo "  Available directories in /tmp:"
-                ls -la /tmp | grep maldetect | sed 's/^/    /'
                     cd /tmp
                     rm -rf "maldetect-"*
                     return 1
@@ -331,28 +330,13 @@ install_all_scanners() {
                         echo ""
                         echo -e "${YELLOW}Full log saved to: $install_log${NC}"
                     fi
-
-                # Check for common Plesk issues
-                if command -v plesk >/dev/null 2>&1; then
-                    echo -e "${YELLOW}Detected Plesk system - checking for conflicts...${NC}"
-
-                    # Check if cron is accessible
-                    if [ ! -w /var/spool/cron ] && [ ! -w /etc/cron.d ]; then
-                        echo "  → Cron directory permissions may be restricted"
-                    fi
-
-                    # Check if required directories exist
-                    if [ ! -d /usr/local/sbin ]; then
-                        echo "  → /usr/local/sbin does not exist (required for maldet)"
-                    fi
-                fi
-
-                return 1
                 fi
+                return 0
             else
                 echo -e "${RED}✗ Download failed - maldetect-current.tar.gz not found${NC}"
-            return 1
+                return 0
             fi
+        ) || true
     else
         echo -e "${GREEN}✓ Maldet already installed${NC}"
     fi