Major user-focused improvements addressing the 90% use case:
1. **QUICK LOCAL SETUP (New #1 Installation Option)**
- One-click installation for local networks
- Automatically configures:
* PTT with mute-by-default
* Auto-answer for kiosks
* Audio ducking
* No COTURN/certificates needed
- Perfect for intercoms, warehouses, offices, security stations
- Detects VPN and offers to use it
- Prompts for PTT button configuration
- Shows server IP and credentials at end
- This is now the RECOMMENDED path for most users
2. **VPN INTERFACE DETECTION**
- New detect_vpn_interface() function
- Auto-detects: Tailscale, WireGuard, OpenVPN (tun/tap)
- Shows detected interfaces with IPs
- Explains VPN benefits vs COTURN
- Offers to bind Asterisk to VPN IP
- Stores config: USE_VPN, VPN_INTERFACE, VPN_IP
- Called in both Quick Setup and Full Install
- Makes VPN the easy choice instead of complex COTURN
3. **SIMPLIFIED COTURN GUIDANCE**
- New "Do you ACTUALLY need COTURN?" screen
- Clear examples of when you DON'T need it:
* Local network only
* Using VPN
* Server with public IP + simple port forwarding
- Clear examples of when you DO need it:
* Symmetric NAT / strict firewall
* VLAN isolation
* Corporate network with limited ports
- Lists COTURN requirements (FQDN, static/DDNS, port forwarding)
- Changed prompt from [Y/n] to [y/N] (opt-in not opt-out)
4. **TURN DOMAIN IMPROVEMENTS**
- TURN_DOMAIN now defaults to DOMAIN_NAME (same domain is fine!)
- Improved prompt explains single vs separate domain options
- Shows info message when using same domain
- Warns about cert coverage when using separate domains
- Makes setup simpler for most users
5. **INSTALLATION MENU UPDATES**
- Quick Local Setup is now option #1 (BOLD, Recommended)
- Full/Server/Client moved to "Advanced Options"
- Clear description: "Local network, PTT, auto-answer - No internet needed"
- Guides users to the right choice
ANSWERS USER'S KEY QUESTIONS:
✓ "Can Asterisk be set up on local network?" → YES, Quick Setup!
✓ "Does it have PTT/auto-answer/mute/ducking?" → YES, all automatic!
✓ "Should I just VPN everything?" → YES, script detects and suggests it!
✓ "Do I need separate FQDN for COTURN?" → NO, same domain works fine!
✓ "Do I really need COTURN?" → Clear guidance shows when you do/don't!
All features maintain full automation - zero manual editing required.
