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/routes.html

@@ -0,0 +1,35 @@
+{% extends "base.html" %}
+{% block title %}Routes – Alpine 5G Router{% endblock %}
+{% block content %}
+<h2>Static routes (SQLite)</h2>
+<p style="color: var(--text-muted); margin: 0 0 1rem;">Routes are stored in SQLite. Add below, then click Apply to run <code>ip route add</code> for each. Existing system routes are not removed.</p>
+
+<div class="table-wrap">
+  <table>
+    <thead>
+      <tr><th>Destination</th><th>Gateway</th><th>Dev</th><th>Metric</th><th>Enabled</th><th>Actions</th></tr>
+    </thead>
+    <tbody id="routesTable"></tbody>
+  </table>
+</div>
+
+<div class="panel-form" style="margin-top: 1rem;">
+  <h3 style="font-size: 0.9375rem; margin: 0 0 0.5rem;">Add route</h3>
+  <div class="form-row">
+    <input type="text" id="routeDest" placeholder="0.0.0.0/0" style="width: 120px;">
+    <input type="text" id="routeGw" placeholder="gateway (optional)" style="width: 100px;">
+    <input type="text" id="routeDev" placeholder="dev (e.g. eth1)" style="width: 80px;">
+    <input type="number" id="routeMetric" placeholder="metric" style="width: 70px;">
+    <button type="button" class="btn btn-primary" id="routeAddBtn">Add</button>
+  </div>
+</div>
+
+<div class="actions" style="margin-top: 1rem;">
+  <button type="button" class="btn btn-primary" id="routesApplyBtn">Apply to system</button>
+  <button type="button" class="btn btn-secondary" id="routesRefreshLive">Refresh live view</button>
+</div>
+<div id="routesMsg" class="msg"></div>
+
+<h3 style="font-size: 0.9375rem; margin: 1.5rem 0 0.5rem;">Current system routes (ip route show)</h3>
+<div class="routes-list" id="routesLive"></div>
+{% endblock %}