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/status.html

@@ -0,0 +1,22 @@
+{% extends "base.html" %}
+{% block title %}Status – Alpine 5G Router{% endblock %}
+{% block content %}
+<h2>Modem &amp; network status</h2>
+<div class="status-grid" id="statusGrid"></div>
+
+<h3 class="status-section">Modem details (AT)</h3>
+<div class="status-grid" id="modemGrid"></div>
+
+<h3 class="status-section">Speedtest</h3>
+<p style="color: var(--text-muted); margin: 0 0 0.5rem;">Run speedtest via 5G (modem) or WAN (eth0).</p>
+<div class="actions" style="margin-bottom: 0.5rem;">
+  <button type="button" class="btn btn-primary" id="speedtest5gBtn">Speedtest (5G)</button>
+  <button type="button" class="btn btn-secondary" id="speedtestWanBtn">Speedtest (WAN)</button>
+</div>
+<div id="speedtestResult" class="speedtest-result"></div>
+<div id="speedtestMsg" class="msg"></div>
+
+<div class="actions" style="margin-top: 1rem;">
+  <button type="button" class="btn btn-secondary" id="refreshStatus">Refresh</button>
+</div>
+{% endblock %}