Pull request 2114: 6480 upd proxy

Updates #6480.

Squashed commit of the following:

commit 03d73fe8f6637b88d11cb331a71c78a0bc79ac7e
Merge: b6f9bd5af 1511fabee
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Dec 25 14:50:08 2023 +0300

    Merge branch 'master' into 6480-upd-proxy

commit b6f9bd5af43c55ec37133fae42f80adc58092f39
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Dec 19 19:31:14 2023 +0300

    dnsforward: imp code, docs

commit db0356cd4c4f4183604ce29b01e05f655519646a
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Dec 19 17:21:53 2023 +0300

    all: log changes

commit 0cbb0e8a6b525088f1f739b777229547fdd1dccb
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Dec 19 16:26:34 2023 +0300

    all: upd proxy

internal/dnsforward/config.go

@@ -150,7 +150,7 @@ type Config struct {
 
 	// MaxGoroutines is the max number of parallel goroutines for processing
 	// incoming requests.
-	MaxGoroutines uint32 `yaml:"max_goroutines"`
+	MaxGoroutines uint `yaml:"max_goroutines"`
 
 	// HandleDDR, if true, handle DDR requests
 	HandleDDR bool `yaml:"handle_ddr"`
@@ -319,7 +319,7 @@ func (s *Server) newProxyConfig() (conf *proxy.Config, err error) {
 		RequestHandler:         s.handleDNSRequest,
 		HTTPSServerName:        aghhttp.UserAgent(),
 		EnableEDNSClientSubnet: srvConf.EDNSClientSubnet.Enabled,
-		MaxGoroutines:          int(srvConf.MaxGoroutines),
+		MaxGoroutines:          srvConf.MaxGoroutines,
 		UseDNS64:               srvConf.UseDNS64,
 		DNS64Prefs:             srvConf.DNS64Prefixes,
 	}