feat(agent): agent stream tunneling with TLS and dTLS (UDP); combined agent APIs

- Add `StreamPort` configuration to agent configuration and environment variables
- Implement TCP and UDP stream client support in agent package
- Update agent verification to test stream connectivity (TCP/UDP)
- Add `/info` endpoint to agent HTTP handler for version, name, runtime, and stream port
- Remove /version, /name, /runtime APIs, replaced by /info
- Update agent compose template to expose stream port for TCP and UDP
- Update agent creation API to optionally specify stream port (defaults to port + 1)
- Modify `StreamRoute` to pass agent configuration to stream implementations
- Update `TCPTCPStream` and `UDPUDPStream` to use agent stream tunneling when agent is configured
- Add support for both direct connections and agent-tunneled connections in stream routes

This enables agents to handle TCP and UDP route tunneling, expanding the proxy capabilities beyond HTTP-only connections.

agent/cmd/main.go

@@ -1,15 +1,18 @@
 package main
 
 import (
+	"net"
 	"os"
 
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
 	"github.com/yusing/godoxy/agent/pkg/agent"
+	"github.com/yusing/godoxy/agent/pkg/agent/stream"
 	"github.com/yusing/godoxy/agent/pkg/env"
 	"github.com/yusing/godoxy/agent/pkg/server"
 	"github.com/yusing/godoxy/internal/metrics/systeminfo"
 	socketproxy "github.com/yusing/godoxy/socketproxy/pkg"
+	gperr "github.com/yusing/goutils/errs"
 	httpServer "github.com/yusing/goutils/server"
 	strutils "github.com/yusing/goutils/strings"
 	"github.com/yusing/goutils/task"
@@ -63,6 +66,16 @@ Tips:
 
 	server.StartAgentServer(t, opts)
 
+	tcpListener, err := net.ListenTCP("tcp", &net.TCPAddr{Port: env.AgentStreamPort})
+	if err != nil {
+		gperr.LogFatal("failed to listen on port", err)
+	}
+	tcpServer := stream.NewTCPServer(t.Context(), tcpListener, caCert.Leaf, srvCert)
+	go tcpServer.Start()
+
+	udpServer := stream.NewUDPServer(t.Context(), &net.UDPAddr{Port: env.AgentStreamPort}, caCert.Leaf, srvCert)
+	go udpServer.Start()
+
 	if socketproxy.ListenAddr != "" {
 		runtime := strutils.Title(string(env.Runtime))