Add stub database selection, and fix differences between pekoe and c-redis

- PUBSUB CHANNELS glob pattern matching
- Implement SELECT + max DB validation (0-15) (default db max is 16), for perl clients
- CLIENT KILL ID (single/range) + MAXAGE
- CLIENT INFO events + resp fields
- PUBSUB SHARDCHANNELS/SHARDNUMSUB stubs

internal/server/server.go

@@ -21,6 +21,8 @@ import (
 	"github.com/eleksir/pekoe/internal/pubsub"
 )
 
+const MaxDatabases = 16 // Redis default maximum databases (0-15)
+
 // Sentinel errors for connection handling
 var (
 	ErrQuit = errors.New("client quit")
@@ -276,6 +278,8 @@ func (s *Server) processCommand(client *pubsub.Client, cmd *Command, writer *Con
 		return s.handleQuit(client, writer)
 	case "client":
 		return s.handleClient(client, cmd.Args[1:], writer)
+	case "select":
+		return s.handleSelect(client, cmd.Args[1:], writer)
 	default:
 		// Check if client is in pubsub mode - only pubsub commands allowed
 		if client != nil && (client.SubsCount() > 0 || client.PatternSubsCount() > 0) {