Add separate IPv4/IPv6 route counts to status page and API

- Update server Stats and StatsResponse structs to include ipv4_routes and ipv6_routes
- Fetch detailed routing table stats to get IPv4/IPv6 breakdown
- Add IPv4 Routes and IPv6 Routes display to HTML status page
- Change metric values to monospace font and remove bold styling

internal/routingtable/routingtable.go

@@ -338,6 +338,28 @@ func (rt *RoutingTable) Clear() {
 	rt.lastMetricsReset = time.Now()
 }
 
+// RLock acquires a read lock on the routing table
+// This is exposed for the snapshotter to use
+func (rt *RoutingTable) RLock() {
+	rt.mu.RLock()
+}
+
+// RUnlock releases a read lock on the routing table
+// This is exposed for the snapshotter to use
+func (rt *RoutingTable) RUnlock() {
+	rt.mu.RUnlock()
+}
+
+// GetAllRoutesUnsafe returns all routes without copying
+// IMPORTANT: Caller must hold RLock before calling this method
+func (rt *RoutingTable) GetAllRoutesUnsafe() []*Route {
+	routes := make([]*Route, 0, len(rt.routes))
+	for _, route := range rt.routes {
+		routes = append(routes, route)
+	}
+	return routes
+}
+
 // Helper methods for index management
 
 func (rt *RoutingTable) addToIndexes(key RouteKey, route *Route) {