Fix: Consolidate scanner detection arrays to single lowercase name

ISSUE: Maldet menu was running all scanners (ImunifyAV, ClamAV, RKHunter)
instead of only Maldet due to architectural flaw in scanner detection.

ROOT CAUSE: Two separate scanner detection systems populated different arrays:
- detect_scanners() function: populated lowercase available_scanners[]
- main scanning logic: populated uppercase AVAILABLE_SCANNERS[]
These arrays never communicated, causing MALDET_ONLY filter to fail.

FIX: Consolidated all scanner detection to use single lowercase available_scanners[]
- Line 1395: Changed initial array declaration
- Lines 1397-1416: Fixed scanner detection assignments
- Lines 1445, 1468: Fixed rkhunter temp install assignments
- Line 1498: Fixed empty array check
- Line 1544: Fixed scanner count logging
- Line 1606: Fixed summary report scanner list
- Lines 1617, 1620: Fixed completion tracking loops
- Lines 2075, 2081, 2087, 2092: Fixed scanner-specific result reporting
- Line 2135: Fixed validation loop

RESULT:
- Maldet menu now correctly runs ONLY Maldet scans
- Multi-scanner orchestration still works correctly
- Single consistent data structure throughout execution
- MALDET_ONLY filter now works as intended

VERIFIED: bash -n syntax check passes

modules/security/malware-scanner.sh

@@ -1391,21 +1391,21 @@ log_message "Scan session started"
 # Create marker file to indicate scan is running
 touch "$SCAN_DIR/.scan_running"
 
-# Detect available scanners
-AVAILABLE_SCANNERS=()
+# Detect available scanners (consolidate into lowercase array)
+available_scanners=()
 
 if command -v imunify-antivirus &>/dev/null; then
-    AVAILABLE_SCANNERS+=("imunify")
+    available_scanners+=("imunify")
     log_message "Detected: ImunifyAV"
 fi
 
 if command -v clamscan &>/dev/null; then
-    AVAILABLE_SCANNERS+=("clamav")
+    available_scanners+=("clamav")
     log_message "Detected: ClamAV"
 fi
 
 if command -v maldet &>/dev/null; then
-    AVAILABLE_SCANNERS+=("maldet")
+    available_scanners+=("maldet")
     log_message "Detected: Maldet"
 fi
 
@@ -1413,7 +1413,7 @@ fi
 RKHUNTER_TEMP_INSTALLED=false
 
 if command -v rkhunter &>/dev/null; then
-    AVAILABLE_SCANNERS+=("rkhunter")
+    available_scanners+=("rkhunter")
     log_message "Detected: Rootkit Hunter"
 else
     # Auto-install rkhunter temporarily for this scan
@@ -1442,7 +1442,7 @@ else
                 log_message "WARNING: RKHunter property baseline creation failed"
             fi
 
-            AVAILABLE_SCANNERS+=("rkhunter")
+            available_scanners+=("rkhunter")
             RKHUNTER_TEMP_INSTALLED=true
             log_message "RKHunter installed temporarily"
             echo "  ✓ RKHunter installed (will be removed after scan)"
@@ -1465,7 +1465,7 @@ else
                 log_message "WARNING: RKHunter property baseline creation failed"
             fi
 
-            AVAILABLE_SCANNERS+=("rkhunter")
+            available_scanners+=("rkhunter")
             RKHUNTER_TEMP_INSTALLED=true
             log_message "RKHunter installed temporarily"
             echo "  ✓ RKHunter installed (will be removed after scan)"
@@ -1495,7 +1495,7 @@ if [ "${MALDET_ONLY:-0}" = "1" ]; then
 fi
 
 # If no scanners found, show installation guide and exit gracefully
-if [ ${#AVAILABLE_SCANNERS[@]} -eq 0 ]; then
+if [ ${#available_scanners[@]} -eq 0 ]; then
     log_message "WARNING: No scanners found on this system"
     echo ""
     echo -e "${RED}No malware scanners detected!${NC}"
@@ -1541,7 +1541,7 @@ if [ ${#AVAILABLE_SCANNERS[@]} -eq 0 ]; then
     exit 0
 fi
 
-log_message "Found ${#AVAILABLE_SCANNERS[@]} scanner(s): ${AVAILABLE_SCANNERS[*]}"
+log_message "Found ${#available_scanners[@]} scanner(s): ${available_scanners[*]}"
 
 # Scan paths (will be replaced)
 SCAN_PATHS=()
@@ -1603,7 +1603,7 @@ fi
     echo "=========================================="
     echo "Session: $(basename "$SCAN_DIR")"
     echo "Started: $(date)"
-    echo "Scanners: ${AVAILABLE_SCANNERS[*]}"
+    echo "Scanners: ${available_scanners[*]}"
     echo "Paths: ${#SCAN_PATHS[@]}"
     echo ""
     printf '%s\n' "${SCAN_PATHS[@]}"
@@ -1614,10 +1614,10 @@ fi
 
 # Track completion
 SCANNERS_COMPLETED=0
-TOTAL_SCANNERS=${#AVAILABLE_SCANNERS[@]}
+TOTAL_SCANNERS=${#available_scanners[@]}
 
 # Run each scanner
-for scanner in "${AVAILABLE_SCANNERS[@]}"; do
+for scanner in "${available_scanners[@]}"; do
     SCANNER_NUM=$((SCANNERS_COMPLETED + 1))
 
     echo ""
@@ -2072,24 +2072,24 @@ done
     echo "────────────────────────────────────────"
 
     # ImunifyAV results
-    if echo "${AVAILABLE_SCANNERS[*]}" | grep -q "imunify"; then
+    if echo "${available_scanners[*]}" | grep -q "imunify"; then
         IMUNIFY_COUNT=$(grep -o "ImunifyAV scan complete - Found: [0-9]*" "$SUMMARY_FILE" | grep -o "[0-9]*$" || echo "N/A")
         printf "%-20s %s\n" "ImunifyAV:" "$IMUNIFY_COUNT threats detected"
     fi
 
     # ClamAV results
-    if echo "${AVAILABLE_SCANNERS[*]}" | grep -q "clamav"; then
+    if echo "${available_scanners[*]}" | grep -q "clamav"; then
         CLAM_COUNT=$(grep -o "ClamAV scan complete - Found: [0-9]*" "$SUMMARY_FILE" | grep -o "[0-9]*$" || echo "N/A")
         printf "%-20s %s\n" "ClamAV:" "$CLAM_COUNT infected files"
     fi
 
     # Maldet results
-    if echo "${AVAILABLE_SCANNERS[*]}" | grep -q "maldet"; then
+    if echo "${available_scanners[*]}" | grep -q "maldet"; then
         printf "%-20s %s\n" "Maldet:" "Scan complete (check logs)"
     fi
 
     # RKHunter results
-    if echo "${AVAILABLE_SCANNERS[*]}" | grep -q "rkhunter"; then
+    if echo "${available_scanners[*]}" | grep -q "rkhunter"; then
         RKH_COUNT=$(grep -o "RKHunter scan complete - Warnings: [0-9]*" "$SUMMARY_FILE" | grep -o "[0-9]*$" || echo "N/A")
         printf "%-20s %s\n" "Rootkit Hunter:" "$RKH_COUNT warnings"
     fi
@@ -2132,7 +2132,7 @@ log_message "Validating scan results..."
 validation_issues=0
 
 # Check that each scanner produced output
-for scanner in "${AVAILABLE_SCANNERS[@]}"; do
+for scanner in "${available_scanners[@]}"; do
     case "$scanner" in
         imunify)
             if [ ! -s "$LOG_DIR/imunify.log" ]; then