Fix Maldet directory detection after extraction

Problem:
- cd maldetect-* was failing because glob expansion doesn't work
  reliably in this context
- Error: "Cannot find extracted directory"

Solution:
- Use find command to locate extracted directory explicitly
- Store directory path in variable before cd
- Add diagnostic output showing available directories on failure
- More robust error handling with explicit directory checks

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

modules/security/malware-scanner.sh

@@ -235,9 +235,20 @@ install_all_scanners() {
                 return 1
             fi
 
-            # Change to extracted directory
-            if ! cd maldetect-* 2>/dev/null; then
+            # Find the extracted directory
+            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
+            fi
+
+            # Change to extracted directory
+            if ! cd "$maldet_dir"; then
+                echo -e "${RED}✗ Cannot access directory: $maldet_dir${NC}"
                 cd /tmp
                 rm -rf "maldetect-"*
                 return 1