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/pubsub/client.go

@@ -31,6 +31,7 @@ type Client struct {
 	conn       net.Conn
 	name       string    // Connection name set via CLIENT SETNAME
 	replyMode  ReplyMode // Reply mode (ON/OFF/SKIP)
+	selectedDB int       // Selected database index (via SELECT command)
 	flags      uint64    // Client flags (e.g., paused, no-touch)
 	created    time.Time // When the client connected
 	lastActive time.Time // Last activity time
@@ -48,6 +49,7 @@ func NewClient(conn net.Conn) *Client {
 		conn:       conn,
 		name:       "",
 		replyMode:  ReplyOn,
+		selectedDB: 0,
 		flags:      0,
 		created:    now,
 		lastActive: now,
@@ -89,6 +91,27 @@ func (c *Client) GetReplyMode() ReplyMode {
 	return c.replyMode
 }
 
+// SelectedDB returns the currently selected database index
+func (c *Client) SelectedDB() int {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	return c.selectedDB
+}
+
+// CreatedAt returns when the client connected
+func (c *Client) CreatedAt() time.Time {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	return c.created
+}
+
+// SetSelectedDB sets the selected database index
+func (c *Client) SetSelectedDB(db int) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.selectedDB = db
+}
+
 // UpdateActivity updates the last activity timestamp
 func (c *Client) UpdateActivity() {
 	c.mu.Lock()
@@ -212,7 +235,7 @@ func (c *Client) LocalAddr() string {
 }
 
 // InfoString returns CLIENT INFO formatted string (Redis format)
-// Format: id= addr= laddr= fd= age= idle= flags= db= sub= psub= multi= qbuf= qbuf-free= obl= oll= omem= tot-mem= cmd= user= redir=
+// Format: id= addr= laddr= fd= age= idle= flags= db= sub= psub= multi= qbuf= qbuf-free= obl= oll= omem= tot-mem= events= cmd= user= redir= resp=
 func (c *Client) InfoString() string {
 	c.mu.RLock()
 	defer c.mu.RUnlock()
@@ -229,16 +252,21 @@ func (c *Client) InfoString() string {
 		flags += "S"
 	}
 
+	// Events - indicate connection is active for read and write
+	events := "rw"
+
 	// Format: Redis CLIENT INFO format
-	return fmt.Sprintf("id=%d addr=%s laddr=%s fd=-1 age=%d idle=%d flags=%s db=0 sub=%d psub=%d multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 tot-mem=0 cmd=client user=default redir=-1",
+	return fmt.Sprintf("id=%d addr=%s laddr=%s fd=-1 age=%d idle=%d flags=%s db=%d sub=%d psub=%d multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 tot-mem=0 events=%s cmd=client user=default redir=-1 resp=2",
 		c.id,
 		c.RemoteAddr(),
 		c.LocalAddr(),
 		age,
 		idle,
 		flags,
+		c.selectedDB,
 		len(c.subscribed),
 		len(c.patterns),
+		events,
 	)
 }