Fix AS detail view and add prefix sorting

- Fix GetASDetails to properly handle timestamp from MAX(last_updated)
- Parse timestamp string from SQLite aggregate function result
- Add natural sorting of prefixes by IP address in AS detail view
- Sort IPv4 and IPv6 prefixes separately by network address
- Remove SQL ORDER BY since we're sorting in Go
- This fixes the issue where AS detail pages showed no prefixes

internal/server/handlers.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"errors"
@@ -8,6 +9,7 @@ import (
 	"net/http"
 	"net/url"
 	"runtime"
+	"sort"
 	"strconv"
 	"time"
 
@@ -500,6 +502,43 @@ func (s *Server) handleASDetail() http.HandlerFunc {
 			}
 		}
 
+		// Sort prefixes by network address
+		sort.Slice(ipv4Prefixes, func(i, j int) bool {
+			// Parse the prefixes to compare network addresses
+			ipI, netI, _ := net.ParseCIDR(ipv4Prefixes[i].Prefix)
+			ipJ, netJ, _ := net.ParseCIDR(ipv4Prefixes[j].Prefix)
+
+			// Compare by network address first
+			cmp := bytes.Compare(ipI.To4(), ipJ.To4())
+			if cmp != 0 {
+				return cmp < 0
+			}
+
+			// If network addresses are equal, compare by mask length
+			onesI, _ := netI.Mask.Size()
+			onesJ, _ := netJ.Mask.Size()
+
+			return onesI < onesJ
+		})
+
+		sort.Slice(ipv6Prefixes, func(i, j int) bool {
+			// Parse the prefixes to compare network addresses
+			ipI, netI, _ := net.ParseCIDR(ipv6Prefixes[i].Prefix)
+			ipJ, netJ, _ := net.ParseCIDR(ipv6Prefixes[j].Prefix)
+
+			// Compare by network address first
+			cmp := bytes.Compare(ipI.To16(), ipJ.To16())
+			if cmp != 0 {
+				return cmp < 0
+			}
+
+			// If network addresses are equal, compare by mask length
+			onesI, _ := netI.Mask.Size()
+			onesJ, _ := netJ.Mask.Size()
+
+			return onesI < onesJ
+		})
+
 		// Prepare template data
 		data := struct {
 			ASN          *database.ASN