Add web GUI, docs, scripts, and 5G router config

- Web app (Flask): status, config, firewall, logs, users, restart
- Docs: AT commands, deploy, DNS, quickstart, web GUI
- Scripts: connect, deploy, diag, healthcheck, modem-status, speedtest, status, troubleshoot
- Init and iptables: 5g-router, 5g-webgui, rules.v4
- CHANGELOG, TODO, REVISION; config and README updates

docs/QUICKSTART.md

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+# Alpine 5G Router – Quick Start
+
+Get a new device from zero to 5G router in a few steps.
+
+## Prerequisites
+
+- Raspberry Pi 5 (or compatible) with Alpine Linux installed
+- Fibocom FM350-GL modem connected via USB (Mode 40: 0e8d:7126)
+- SIM card with data (e.g. CYTA Cyprus, APN `internet`)
+
+## 1. Clone repo on the device (or copy files)
+
+```bash
+# If you have git on the device:
+git clone https://github.com/YOUR_USER/Alpine_5G.git /tmp/Alpine_5G
+cd /tmp/Alpine_5G
+
+# Or: copy the repo (e.g. scp -r Alpine_5G root@device:/tmp/)
+```
+
+## 2. Install packages (on the device)
+
+```bash
+# Enable community repo if needed
+sed -i 's|#.*community|http://mirrors.neterra.net/alpine/v3.23/community|' /etc/apk/repositories
+apk update
+apk add iptables libmbim-tools qmi-utils
+# Optional: dnsmasq for LAN DHCP/DNS, speedtest-cli for speedtests
+apk add dnsmasq speedtest-cli
+```
+
+## 3. Run install script
+
+From the repo root:
+
+```bash
+cd /tmp/Alpine_5G
+chmod +x scripts/install.sh
+./scripts/install.sh
+```
+
+This installs:
+
+- `/etc/5g-router.conf` (from example – edit if needed)
+- `/usr/local/bin/connect-5g.sh`, `status-5g.sh`, `healthcheck-5g.sh`, etc.
+- `/etc/init.d/5g-router` (OpenRC service)
+- `/etc/iptables/rules.v4`
+- Enables `5g-router` at boot
+
+## 4. Edit config (if needed)
+
+```bash
+vi /etc/5g-router.conf
+```
+
+Set at least:
+
+- `APN` – e.g. `internet` for CYTA
+- `WAN_IF` / `LAN_IF` – default `eth1` and `eth0.100` are usually correct
+
+Optional: `FAILOVER_ENABLED=yes` and `FAILOVER_IF=eth0` to use ethernet when 5G is down.
+
+## 5. Start 5G and test
+
+```bash
+service 5g-router start
+# Or run once:
+/usr/local/bin/connect-5g.sh
+
+# Check status
+/usr/local/bin/status-5g.sh
+
+# Test connectivity
+ping -c 3 8.8.8.8
+```
+
+## 6. Enable iptables restore at boot (if not already)
+
+```bash
+rc-update add iptables-restore default
+```
+
+## Done
+
+The device will bring up 5G at boot. To restart 5G: `service 5g-router restart`.  
+For full docs see [README.md](../README.md) and [5G_MODEM_TROUBLESHOOTING.md](../5G_MODEM_TROUBLESHOOTING.md).