Implement Acronis Cyber Protect agent management scripts

Created 11 comprehensive scripts for Acronis backup management:

Installation & Setup:
- acronis-install.sh: Download/install agent with multiple modes
  * Interactive, unattended, with/without registration
  * Supports token-based registration during install
  * Auto-service startup and verification
- acronis-register.sh: Register agent with Acronis Cloud
  * Validates service URL and token
  * Shows current registration status
  * Safe re-registration with confirmation
- acronis-configure.sh: Guidance for backup plan configuration
  * Web console walkthrough
  * Common backup plan examples

Backup Operations:
- acronis-manual-backup.sh: Manual backup creation guide
  * Web console and CLI methods
  * Ready for full CLI implementation
- acronis-status.sh: View backup status from logs
  * Recent backup activity
  * acrocmd integration ready
- acronis-list-backups.sh: List available backup archives
  * acrocmd integration for archive listing
- acronis-restore.sh: Restore from backup guide
  * Multiple restore methods explained
  * Safety warnings and best practices

Management:
- acronis-agent-status.sh: Comprehensive service status
  * All 4 services (aakore, mms, schedule, active-protection)
  * Registration status, network ports, storage
  * Quick actions: start/stop/restart/logs/version
- acronis-update.sh: Agent update management
  * Auto and manual update methods
  * Version checking
- acronis-logs.sh: Advanced log viewer
  * View, tail, search logs
  * Error filtering with color coding
  * Log archival for old logs
- acronis-uninstall.sh: Safe agent removal
  * Stops services, unregisters, removes packages
  * Optional data retention
  * Comprehensive cleanup

All scripts based on documented Acronis commands with proper error
handling, status validation, and user-friendly interfaces.

modules/backup/acronis-list-backups.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+source "$SCRIPT_DIR/lib/common-functions.sh"
+
+if [ "$EUID" -ne 0 ]; then
+    print_error "This script must be run as root"
+    exit 1
+fi
+
+print_banner "List Available Backups"
+
+echo ""
+echo -e "${BOLD}Available Backups${NC}"
+echo ""
+
+# Check if acrocmd exists
+if ! command -v acrocmd &>/dev/null; then
+    echo -e "${YELLOW}acrocmd CLI tool not found${NC}"
+    echo ""
+    echo "To list backups:"
+    echo "  • Use Acronis web console (recommended)"
+    echo "  • Log in and navigate to: Backup → Backup plans"
+    echo "  • View all backup archives and recovery points"
+    echo ""
+    echo "Command line option:"
+    echo "  acrocmd list archives"
+    echo "  acrocmd list recoverypoints"
+    echo ""
+    press_enter
+    exit 0
+fi
+
+echo "Querying backup archives..."
+echo ""
+
+# Try to list archives
+if acrocmd list archives 2>/dev/null; then
+    echo ""
+else
+    echo "No archives found or command failed"
+    echo ""
+fi
+
+press_enter