feat: Add comprehensive log path mapping for all platforms

NEW FILES:
- lib/log-paths.sh: Derives all log file paths based on detected system

ENHANCEMENTS:
- Added detect_mail_system() to lib/system-detect.sh
  - Detects: Exim (cPanel), Postfix (Plesk), Sendmail
- Updated initialize_system_detection() to call derive_all_log_paths()
- Updated launcher.sh to source log-paths.sh

LOG PATH CATEGORIES NOW DERIVED:
1. Web Server Logs (domain + main access/error)
2. Authentication Logs (SSH, sudo, logins)
3. Mail System Logs (Exim, Postfix, Sendmail)
4. Firewall Logs (CSF, firewalld, iptables)
5. Control Panel Logs (cPanel, Plesk, InterWorx)
6. Database Logs (MySQL, MariaDB, PostgreSQL)
7. Security Scanner Logs (ClamAV, Maldet, Rkhunter, Imunify)
8. System Logs (messages/syslog, kernel, auth)
9. PHP Logs (FPM, error logs)
10. Service Logs (FTP, DNS, SSH)

All paths now account for:
- Control panel differences (cPanel vs Plesk vs InterWorx vs Standalone)
- OS differences (RHEL/CentOS/AlmaLinux vs Ubuntu/Debian)
- Mail system differences (Exim vs Postfix vs Sendmail)
- Database differences (MySQL vs MariaDB vs PostgreSQL)

lib/system-detect.sh

@@ -397,6 +397,43 @@ detect_firewall() {
     return 1
 }
 
+#############################################################################
+# MAIL SYSTEM DETECTION
+#############################################################################
+
+detect_mail_system() {
+    [ -n "$SYS_DETECTION_COMPLETE" ] || print_info "Detecting mail system..."
+
+    # Exim (cPanel default)
+    if command_exists exim; then
+        SYS_MAIL_SYSTEM="exim"
+        SYS_MAIL_SYSTEM_VERSION=$(exim -bV 2>/dev/null | head -1 | grep -oP 'Exim version \K[^ ]+' || echo "unknown")
+        print_success "Detected Exim ${SYS_MAIL_SYSTEM_VERSION}"
+        return 0
+    fi
+
+    # Postfix
+    if command_exists postqueue; then
+        SYS_MAIL_SYSTEM="postfix"
+        SYS_MAIL_SYSTEM_VERSION=$(postconf mail_version 2>/dev/null | grep -oP '\d+\.\d+\.\d+' | head -1 || echo "unknown")
+        print_success "Detected Postfix ${SYS_MAIL_SYSTEM_VERSION}"
+        return 0
+    fi
+
+    # Sendmail
+    if command_exists sendmail; then
+        SYS_MAIL_SYSTEM="sendmail"
+        SYS_MAIL_SYSTEM_VERSION=$(sendmail -d0.1 -O QueueDirectory=/tmp 2>&1 | head -1 | grep -oP '\d+\.\d+\.\d+' || echo "unknown")
+        print_success "Detected Sendmail ${SYS_MAIL_SYSTEM_VERSION}"
+        return 0
+    fi
+
+    SYS_MAIL_SYSTEM="none"
+    SYS_MAIL_SYSTEM_VERSION=""
+    print_warning "No mail system detected"
+    return 1
+}
+
 #############################################################################
 # SYSTEM RESOURCES (Comprehensive - like user's example)
 #############################################################################
@@ -564,10 +601,16 @@ initialize_system_detection() {
     detect_php_versions
     detect_cloudflare
     detect_firewall
+    detect_mail_system
     get_system_resources
 
     # Mark as initialized
     export SYS_DETECTION_COMPLETE="yes"
+
+    # Derive platform-specific log paths (requires detect_* functions to have run first)
+    if command -v derive_all_log_paths &>/dev/null; then
+        derive_all_log_paths
+    fi
 }
 
 # Export all functions for use in subshells and sourced scripts
@@ -578,6 +621,7 @@ export -f detect_database
 export -f detect_php_versions
 export -f detect_cloudflare
 export -f detect_firewall
+export -f detect_mail_system
 export -f get_system_resources
 export -f show_system_info
 export -f initialize_system_detection