feat: maintenance windows, reports, uptime widget, alert improvements

- Add maintenance window scheduling to suppress alerts during planned
  downtime (model, routes, templates)
- Add weekly email/webhook reports with host summary (core/reports.py,
  Settings → Reports tab)
- Add host uptime history widget with per-check sparkline view
- Expand alert rules: dynamic metric catalog for plugin sources,
  per-rule HTMX field loading, maintenance window awareness
- Register additional dashboard widgets (uptime, SNMP, UniFi, UPS)
- Add Settings → Reports tab configuration

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

fabledscryer/templates/alerts/list.html

@@ -49,7 +49,10 @@
 
 <div style="display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem;">
     <h2 class="section-title">Rules</h2>
-    <a class="btn" href="/alerts/rules/new">New Rule</a>
+    <div style="display:flex;gap:0.5rem;">
+        <a class="btn btn-ghost" href="/alerts/maintenance">Maintenance</a>
+        <a class="btn" href="/alerts/rules/new">New Rule</a>
+    </div>
 </div>
 {% if rules %}
 <div class="card-flush">
@@ -58,24 +61,33 @@
             <tr>
                 <th>Name</th>
                 <th>Condition</th>
-                <th>Consec.</th>
-                <th>Enabled</th>
+                <th style="text-align:center;">Consec.</th>
                 <th></th>
             </tr>
         </thead>
         <tbody>
             {% for rule in rules %}
-            <tr>
-                <td>{{ rule.name }}</td>
-                <td style="color:var(--text-muted);">
-                    {{ rule.source_module }}/{{ rule.resource_name }}:{{ rule.metric_name }}
-                    {{ rule.operator.value }} {{ rule.threshold }}
-                </td>
-                <td style="color:var(--text-muted);">{{ rule.consecutive_failures_required }}</td>
+            <tr {% if not rule.enabled %}style="opacity:0.55;"{% endif %}>
                 <td>
-                    {% if rule.enabled %}<span class="badge badge-green">yes</span>{% else %}<span class="badge badge-dim">no</span>{% endif %}
+                  {{ rule.name }}
+                  {% if not rule.enabled %}
+                  <span style="font-size:0.72rem;color:var(--text-dim);margin-left:0.35rem;">disabled</span>
+                  {% endif %}
                 </td>
+                <td style="color:var(--text-muted);font-size:0.85rem;">
+                  <span style="color:var(--text-dim);">{{ rule.source_module }}/</span>{{ rule.resource_name }}
+                  <span style="font-family:ui-monospace,monospace;font-size:0.8rem;">
+                    :{{ rule.metric_name }} {{ rule.operator.value }} {{ rule.threshold }}
+                  </span>
+                </td>
+                <td style="color:var(--text-muted);text-align:center;">{{ rule.consecutive_failures_required }}</td>
                 <td class="td-actions">
+                    <a href="/alerts/rules/{{ rule.id }}/edit" class="btn btn-sm btn-ghost">Edit</a>
+                    <form method="post" action="/alerts/rules/{{ rule.id }}/toggle" style="display:inline;">
+                        <button type="submit" class="btn btn-sm btn-ghost">
+                          {% if rule.enabled %}Disable{% else %}Enable{% endif %}
+                        </button>
+                    </form>
                     <form method="post" action="/alerts/rules/{{ rule.id }}/delete" style="display:inline;">
                         <button type="submit" class="btn btn-sm btn-danger"
                             onclick="return confirm('Delete rule {{ rule.name }}?')">Delete</button>