feat(api): implement protocol multiplexer and Redis queue for usage integration

- Added `protocol_multiplexer.go`, enabling support for both HTTP and Redis protocols on a single listener.
- Introduced `redis_queue_protocol.go` to handle Redis-compatible RESP commands for queue management.
- Integrated `redisqueue` package, supporting in-memory queuing with expiration pruning.
- Updated server initialization to manage a shared listener and multiplex connections.
- Adjusted `Handler` to adopt `AuthenticateManagementKey` for modular key validation, supporting both HTTP and Redis flows.

internal/api/buffered_conn.go

@@ -0,0 +1,32 @@
+package api
+
+import (
+	"bufio"
+	"crypto/tls"
+	"net"
+)
+
+type bufferedConn struct {
+	net.Conn
+	reader *bufio.Reader
+}
+
+func (c *bufferedConn) Read(p []byte) (int, error) {
+	if c == nil {
+		return 0, net.ErrClosed
+	}
+	if c.reader == nil {
+		return c.Conn.Read(p)
+	}
+	return c.reader.Read(p)
+}
+
+func (c *bufferedConn) ConnectionState() tls.ConnectionState {
+	if c == nil || c.Conn == nil {
+		return tls.ConnectionState{}
+	}
+	if stater, ok := c.Conn.(interface{ ConnectionState() tls.ConnectionState }); ok {
+		return stater.ConnectionState()
+	}
+	return tls.ConnectionState{}
+}