feat: add Jinja2 admin UI templates

app/templates/index.html

@@ -1 +1,50 @@
-{% extends "base.html" %}{% block content %}index{% endblock %}
+{% extends "base.html" %}
+{% block content %}
+<div style="display:flex; justify-content:space-between; align-items:center; margin-bottom:16px;">
+  <h1>Configs</h1>
+  <a href="/configs/new" class="btn btn-primary">+ New Config</a>
+</div>
+
+{% if configs %}
+<table>
+  <thead>
+    <tr>
+      <th>Name</th>
+      <th>Client URL</th>
+      <th>Last Export</th>
+      <th>Nodes</th>
+      <th>Actions</th>
+    </tr>
+  </thead>
+  <tbody>
+    {% for config in configs %}
+    <tr>
+      <td><a href="/configs/{{ config.id }}">{{ config.name }}</a></td>
+      <td>
+        <span class="token-url">{{ request.url.scheme }}://{{ request.url.netloc }}/config/{{ config.token }}.yaml</span>
+      </td>
+      <td>
+        {% set log = last_logs[config.id] %}
+        {% if log %}
+          <span class="{{ 'success' if log.success else 'error' }}">
+            {{ log.fetched_at.strftime('%Y-%m-%d %H:%M') }}
+          </span>
+        {% else %}
+          <span style="color:#999">Never</span>
+        {% endif %}
+      </td>
+      <td>{{ last_logs[config.id].node_count if last_logs[config.id] else '—' }}</td>
+      <td>
+        <a href="/configs/{{ config.id }}" class="btn btn-sm btn-primary">Edit</a>
+        <a href="/configs/{{ config.id }}/logs" class="btn btn-sm" style="background:#6b7280;color:#fff;">Logs</a>
+      </td>
+    </tr>
+    {% endfor %}
+  </tbody>
+</table>
+{% else %}
+<div class="card">
+  <p style="color:#666; text-align:center;">No configs yet. <a href="/configs/new">Create one.</a></p>
+</div>
+{% endif %}
+{% endblock %}