Initial WireGuard admin panel: FastAPI UI, peer key management, live monitoring, Docker deploy

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

app/templates/settings.html

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+{% extends "base.html" %}
+{% block title %}Settings - WireGuard Admin{% endblock %}
+{% block content %}
+<h1>Settings</h1>
+<div class="card">
+  <table class="kv">
+    <tr><th>Interface</th><td>{{ settings.wg_interface }}</td></tr>
+    <tr><th>Server public key</th><td><code>{{ server_public }}</code></td></tr>
+    <tr><th>Endpoint host</th><td>{{ settings.wg_host }}</td></tr>
+    <tr><th>Listen port</th><td>{{ settings.wg_port }}</td></tr>
+    <tr><th>Subnet</th><td>{{ settings.wg_subnet }}</td></tr>
+    <tr><th>Client DNS</th><td>{{ settings.wg_dns }}</td></tr>
+    <tr><th>Client AllowedIPs</th><td>{{ settings.wg_allowed_ips }}</td></tr>
+    <tr><th>Keepalive</th><td>{{ settings.wg_persistent_keepalive }}s</td></tr>
+  </table>
+  <p class="muted">Settings are read from environment variables / .env and require a restart to change.</p>
+</div>
+{% endblock %}