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/routewatch/app_integration_test.go

@@ -157,6 +157,24 @@ func (m *mockStore) GetStats() (database.Stats, error) {
 	}, nil
 }
 
+// UpsertLiveRoute mock implementation
+func (m *mockStore) UpsertLiveRoute(route *database.LiveRoute) error {
+	// Simple mock - just return nil
+	return nil
+}
+
+// DeleteLiveRoute mock implementation
+func (m *mockStore) DeleteLiveRoute(prefix string, originASN int, peerIP string) error {
+	// Simple mock - just return nil
+	return nil
+}
+
+// GetPrefixDistribution mock implementation
+func (m *mockStore) GetPrefixDistribution() (ipv4 []database.PrefixDistribution, ipv6 []database.PrefixDistribution, err error) {
+	// Return empty distributions for now
+	return nil, nil, nil
+}
+
 func TestRouteWatchLiveFeed(t *testing.T) {
 	// Disable snapshotter for tests
 	t.Setenv("ROUTEWATCH_DISABLE_SNAPSHOTTER", "1")