fix: address staticcheck lint issues

- avoid deprecated DefaultIdleTimeout, use time.Minute directly
- simplify embedded field selectors (QF1008)

internal/cli/run_proxy.go

 	"fmt"
 	"net"
 	"os"
+	"time"
 
 	"github.com/9seconds/mtg/v2/antireplay"
 	"github.com/9seconds/mtg/v2/events"
 
 		AllowFallbackOnUnknownDC: conf.AllowFallbackOnUnknownDC.Get(false),
 		TolerateTimeSkewness:     conf.TolerateTimeSkewness.Value,
-		IdleTimeout:              conf.Network.Timeout.Idle.Get(mtglib.DefaultIdleTimeout),
+		IdleTimeout:              conf.Network.Timeout.Idle.Get(time.Minute),
 
 		DoppelGangerURLs:    doppelGangerURLs,
 		DoppelGangerPerRaid: conf.Defense.Doppelganger.Repeats.Get(mtglib.DoppelGangerPerRaid),

mtglib/conns.go

 }
 
 func (c connIdleTimeout) Read(b []byte) (int, error) {
-	c.Conn.SetReadDeadline(time.Now().Add(c.timeout)) //nolint: errcheck
+	c.SetReadDeadline(time.Now().Add(c.timeout)) //nolint: errcheck
 
 	return c.Conn.Read(b) //nolint: wrapcheck
 }
 
 func (c connIdleTimeout) Write(b []byte) (int, error) {
-	c.Conn.SetWriteDeadline(time.Now().Add(c.timeout)) //nolint: errcheck
+	c.SetWriteDeadline(time.Now().Add(c.timeout)) //nolint: errcheck
 
 	return c.Conn.Write(b) //nolint: wrapcheck
 }

mtglib/proxy_opts.go

 
 func (p ProxyOpts) getIdleTimeout() time.Duration {
 	if p.IdleTimeout == 0 {
-		return DefaultIdleTimeout
+		return time.Minute
 	}
 
 	return p.IdleTimeout