Remove Rule Cache stats from system health page

Eliminated the Rule Cache statistics card from the system health admin template and expanded the AI Result Cache card to full width. This simplifies the cache statistics section and focuses on AI Result Cache metrics.

Author: Bentlybro

app/templates/admin/system_health.html

@@ -52,7 +52,7 @@ <h3 class="text-warning">{{ system_stats.uptime_hours }}h</h3>
 
 <!-- Cache Statistics -->
 <div class="row mb-4">
-    <div class="col-md-6">
+    <div class="col-md-12">
         <div class="card">
             <div class="card-header">
                 <h5 class="mb-0"><i class="fas fa-brain"></i> AI Result Cache</h5>
@@ -85,28 +85,6 @@ <h5 class="mb-0"><i class="fas fa-brain"></i> AI Result Cache</h5>
             </div>
         </div>
     </div>
-
-    <div class="col-md-6">
-        <div class="card">
-            <div class="card-header">
-                <h5 class="mb-0"><i class="fas fa-list"></i> Rule Cache</h5>
-            </div>
-            <div class="card-body">
-                <table class="table table-sm">
-                    <tbody>
-                        <tr>
-                            <td><strong>Cached Projects</strong></td>
-                            <td>{{ cache_stats.rule_cache.cached_projects }}</td>
-                        </tr>
-                        <tr>
-                            <td><strong>Oldest Cache Age</strong></td>
-                            <td>{{ (cache_stats.rule_cache.oldest_cache_age / 60)|int }} minutes</td>
-                        </tr>
-                    </tbody>
-                </table>
-            </div>
-        </div>
-    </div>
 </div>
 
 <!-- Database Connection Pool -->