Add standalone intercom setup system (Mumble/Talkkonnect)

Created modular, standalone intercom system to avoid bloating the
10,000+ line main install script.

New Files:
- setup_intercom.sh: Complete standalone installation and management
  * Install Murmur server (one kiosk becomes the server)
  * Install talkkonnect client (connect to existing server)
  * Install both (all-in-one setup)
  * Full service management (start/stop/restart)
  * Configuration tools
  * Log viewing
  * Uninstall options

- INTERCOM_README.md: Comprehensive documentation
  * Quick start guide
  * Use cases and scenarios
  * Multi-kiosk setup instructions
  * Troubleshooting guide
  * Integration instructions
  * Technical details

- integrate_intercom.sh: Integration helper
  * Shows how to wire into main install script
  * Example menu integration code
  * Alternative sourcing method

Features:
✓ Menu-driven interface with dynamic options
✓ Status display (installed/running state)
✓ Server configuration (password, port, welcome text)
✓ Client configuration (server, credentials, channel)
✓ Service management (enable/disable/start/stop)
✓ Log viewing for diagnostics
✓ Clean uninstallation

Use Cases:
1. Single kiosk (server + client)
2. Multi-kiosk (one server, multiple clients)
3. Connect to external Mumble server
4. Other devices can connect (desktop/mobile Mumble apps)

Technical:
- Murmur server on port 64738
- talkkonnect built from source with Go
- Systemd service management
- Audio through ALSA/PipeWire
- PTT via keyboard (default: spacebar)

Next Steps:
- Test installation on clean system
- Wire into main install script addon menu
- Consider auto-discovery for multi-kiosk setups

integrate_intercom.sh

@@ -0,0 +1,99 @@
+#!/bin/bash
+################################################################################
+### Integration Helper for Intercom Setup
+################################################################################
+#
+# This script shows how to integrate the standalone intercom setup
+# into the main UBK install script.
+#
+# Usage:
+#   1. Copy this code block into your main install script
+#   2. Add a menu option to call launch_intercom_setup()
+#   3. The intercom setup will run as a subshell and return control
+#
+################################################################################
+
+# Get the directory where scripts are located
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+launch_intercom_setup() {
+    local intercom_script="$SCRIPT_DIR/setup_intercom.sh"
+
+    if [[ ! -f "$intercom_script" ]]; then
+        echo "[ERROR] Intercom setup script not found at: $intercom_script"
+        echo "Please ensure setup_intercom.sh is in the same directory as this script"
+        read -r -p "Press Enter to continue..."
+        return 1
+    fi
+
+    # Make sure it's executable
+    chmod +x "$intercom_script"
+
+    # Launch the intercom setup
+    bash "$intercom_script"
+
+    # Return code will be passed through
+    return $?
+}
+
+################################################################################
+### Example Integration into Main Install Script
+################################################################################
+
+# Add this to your addon menu section:
+#
+# addon_menu() {
+#     while true; do
+#         clear
+#         echo "════════════════════════════════════════════════════════════"
+#         echo "   ADDONS MENU"
+#         echo "════════════════════════════════════════════════════════════"
+#         echo
+#         echo "  1. VNC Remote Desktop"
+#         echo "  2. WireGuard VPN"
+#         echo "  3. Tailscale"
+#         echo "  4. Netbird"
+#         echo "  5. Jitsi Intercom"
+#         echo "  6. Mumble/Talkkonnect Intercom"  # <-- Add this line
+#         echo "  0. Return to main menu"
+#         echo
+#         read -r -p "Choose: " addon_choice
+#
+#         case "$addon_choice" in
+#             1) addon_vnc ;;
+#             2) addon_wireguard ;;
+#             3) addon_tailscale ;;
+#             4) addon_netbird ;;
+#             5) addon_jitsi_intercom ;;
+#             6) launch_intercom_setup ;;  # <-- Add this line
+#             0) return ;;
+#         esac
+#     done
+# }
+
+################################################################################
+### Alternative: Direct Function Call
+################################################################################
+
+# If you want even tighter integration, you can source the intercom script
+# and call its functions directly. This requires modifying setup_intercom.sh
+# to check if it's being sourced or run directly:
+#
+# In setup_intercom.sh, replace the main entry point section with:
+#
+# if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+#     # Script is being run directly
+#     main_menu
+# fi
+#
+# Then you can source it:
+#
+# source "$SCRIPT_DIR/setup_intercom.sh"
+# install_murmur_and_talkkonnect  # Call functions directly
+
+################################################################################
+### Quick Test
+################################################################################
+
+# Uncomment to test this integration helper:
+# launch_intercom_setup