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/pkg/handler/handler.go

@@ -1,9 +1,9 @@
 package handler
 
 import (
-	"fmt"
 	"net/http"
 
+	"github.com/bytedance/sonic"
 	"github.com/gin-gonic/gin"
 	"github.com/gorilla/websocket"
 	"github.com/yusing/godoxy/agent/pkg/agent"
@@ -44,14 +44,14 @@ func NewAgentHandler() http.Handler {
 	}
 
 	mux.HandleFunc(agent.EndpointProxyHTTP+"/{path...}", ProxyHTTP)
-	mux.HandleEndpoint("GET", agent.EndpointVersion, func(w http.ResponseWriter, r *http.Request) {
-		fmt.Fprint(w, version.Get())
-	})
-	mux.HandleEndpoint("GET", agent.EndpointName, func(w http.ResponseWriter, r *http.Request) {
-		fmt.Fprint(w, env.AgentName)
-	})
-	mux.HandleEndpoint("GET", agent.EndpointRuntime, func(w http.ResponseWriter, r *http.Request) {
-		fmt.Fprint(w, env.Runtime)
+	mux.HandleFunc(agent.EndpointInfo, func(w http.ResponseWriter, r *http.Request) {
+		agentInfo := agent.AgentInfo{
+			Version:    version.Get(),
+			Name:       env.AgentName,
+			Runtime:    env.Runtime,
+			StreamPort: env.AgentStreamPort,
+		}
+		sonic.ConfigDefault.NewEncoder(w).Encode(agentInfo)
 	})
 	mux.HandleEndpoint("GET", agent.EndpointHealth, CheckHealth)
 	mux.HandleEndpoint("GET", agent.EndpointSystemInfo, metricsHandler.ServeHTTP)