Separate IPv4 and IPv6 routes into different tables

- Create live_routes_v4 and live_routes_v6 tables
- Update all database methods to use appropriate table
- Add IP version detection in database queries
- Remove filtering by ip_version column for better performance
- Fix route count queries that were timing out
- Update PrefixHandler to include IP version in deletions

internal/database/models.go

@@ -83,6 +83,7 @@ type LiveRouteDeletion struct {
 	Prefix    string
 	OriginASN int
 	PeerIP    string
+	IPVersion int
 }
 
 // PeerUpdate represents parameters for updating a peer