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

web/templates/logs.html

@@ -0,0 +1,10 @@
+{% extends "base.html" %}
+{% block title %}Logs – Alpine 5G Router{% endblock %}
+{% block content %}
+<h2>Logs</h2>
+<div class="actions" style="margin-bottom: 0.5rem;">
+  <button type="button" class="btn btn-secondary" data-log="5g">5G router log</button>
+  <button type="button" class="btn btn-secondary" data-log="speedtest">Speedtest log</button>
+</div>
+<div class="log-view" id="logView">Select a log above.</div>
+{% endblock %}