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

TODO.md

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+# Alpine 5G Router – TODO / Features
+
+Track features and tasks for the solution. Use `[ ]` for pending, `[x]` for done.
+
+---
+
+## Connection & modem
+
+- [x] Auto-reconnect when 5G link drops (watchdog or periodic check)
+- [x] Configurable APN (env var or config file) for different carriers
+- [x] USB mode check on boot (warn or fix if modem is in Mode 41)
+- [x] Signal strength logging / alert when signal is weak
+- [x] Fallback to eth0 (e.g. LAN) when 5G is unavailable (optional)
+
+---
+
+## Network & routing
+
+- [x] Persist default route preference (5G vs eth0) across reboots
+- [x] Optional dual-WAN or failover (5G + ethernet)
+- [x] Firewall rules in repo (e.g. `etc/iptables/rules.v4`) for repeatable setup
+- [ ] IPv6 support (if carrier provides it)
+
+---
+
+## Deployment & automation
+
+- [x] Add `connect-5g.sh` (or equivalent) to repo for version control
+- [x] Add OpenRC service file(s) to repo (e.g. `etc/init.d/5g-router`)
+- [x] Install/setup script: deploy scripts + service + firewall from repo to device
+- [x] Document or automate DNS (e.g. resolv.conf / dnsmasq) for 5G
+
+---
+
+## Monitoring & ops
+
+- [x] Simple status script or endpoint (modem, interface, default route, last speedtest)
+- [x] Optional speedtest on schedule (cron) with log or alert
+- [x] Log rotation for `5g-router.log` (and any other logs)
+- [x] Health check script for monitoring (Nagios, Uptime Kuma, etc.)
+
+---
+
+## Documentation & config
+
+- [x] Single "quick start" for new device (clone repo → run script → done)
+- [x] Document or script for first-time SSH/key setup
+- [x] Example or template config (APN, interfaces, firewall) for different carriers
+- [x] Changelog or version notes for script/service changes
+
+---
+
+## Web GUI
+
+- [x] Login screen with admin and support users and different permissions
+- [x] Configuration Modem/network interfaces (admin: /etc/5g-router.conf)
+- [x] Monitoring status Modem/systems (Status tab)
+- [ ] Data consumption from both terminals (graphs/tables) – *future: needs traffic accounting e.g. vnstat*
+- [x] Logs modem/system (5G router log + speedtest log)
+- [x] List/add/modify firewall rules (admin: iptables rules.v4)
+- [x] List/modify static routes (admin: ip route view)
+- [x] User management (admin: add/delete users, set password)
+- [x] Restart 5G (admin + support)
+
+---
+
+*Edit this file to add/remove items and check off completed work.*