Add live routing table with CIDR mask length tracking

- Added new live_routes table with mask_length column for tracking CIDR prefix lengths
- Updated PrefixHandler to maintain live routing table with additions and deletions
- Added route expiration functionality (5 minute timeout) to in-memory routing table
- Added prefix distribution stats showing count of prefixes by mask length
- Added IPv4/IPv6 prefix distribution cards to status page
- Updated database interface with UpsertLiveRoute, DeleteLiveRoute, and GetPrefixDistribution
- Set all handler queue depths to 50000 for consistency
- Doubled DBHandler batch size to 32000 for better throughput
- Fixed withdrawal handling to delete routes when origin ASN is available

internal/templates/status.html

@@ -153,6 +153,22 @@
         </div>
     </div>
     
+    <div class="status-grid">
+        <div class="status-card">
+            <h2>IPv4 Prefix Distribution</h2>
+            <div id="ipv4-prefix-distribution">
+                <!-- Will be populated dynamically -->
+            </div>
+        </div>
+        
+        <div class="status-card">
+            <h2>IPv6 Prefix Distribution</h2>
+            <div id="ipv6-prefix-distribution">
+                <!-- Will be populated dynamically -->
+            </div>
+        </div>
+    </div>
+    
     <div id="handler-stats-container" class="status-grid">
         <!-- Handler stats will be dynamically added here -->
     </div>
@@ -170,6 +186,29 @@
             return num.toLocaleString();
         }
         
+        function updatePrefixDistribution(elementId, distribution) {
+            const container = document.getElementById(elementId);
+            container.innerHTML = '';
+            
+            if (!distribution || distribution.length === 0) {
+                container.innerHTML = '<div class="metric"><span class="metric-label">No data</span></div>';
+                return;
+            }
+            
+            // Sort by mask length
+            distribution.sort((a, b) => a.mask_length - b.mask_length);
+            
+            distribution.forEach(item => {
+                const metric = document.createElement('div');
+                metric.className = 'metric';
+                metric.innerHTML = `
+                    <span class="metric-label">/${item.mask_length}</span>
+                    <span class="metric-value">${formatNumber(item.count)}</span>
+                `;
+                container.appendChild(metric);
+            });
+        }
+        
         function updateHandlerStats(handlerStats) {
             const container = document.getElementById('handler-stats-container');
             container.innerHTML = '';
@@ -249,6 +288,10 @@
                     // Update handler stats
                     updateHandlerStats(data.handler_stats || []);
                     
+                    // Update prefix distribution
+                    updatePrefixDistribution('ipv4-prefix-distribution', data.ipv4_prefix_distribution);
+                    updatePrefixDistribution('ipv6-prefix-distribution', data.ipv6_prefix_distribution);
+                    
                     // Clear any errors
                     document.getElementById('error').style.display = 'none';
                 })