feat(frpLogger): add real-time instance log streaming functionality

Implement cross-platform log streaming for frpc instances with support for Windows, systemd, and init.d systems. Includes WebSocket API endpoint for real-time log streaming, token validation, and instance ownership checks. Update README and API documentation to reflect new functionality.

The implementation handles:
- Platform-specific log collection (Windows Event Log, journalctl, log files)
- WebSocket-based real-time streaming
- Token validation and instance access control
- Log level parsing and formatting
- Historical log retrieval since service start

router.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"net/http"
+	"super-frpc/frpLogger"
 	"super-frpc/postLog"
 )
 
@@ -10,8 +11,8 @@ func setupRoutes() {
 	postLog.Info("Setting up routes...")
 	http.HandleFunc("/system/getStatus", GetStatusHandler)
 	http.HandleFunc("/system/getSoftwareInfo", GetSoftwareInfoHandler)
-	logHandler := postLog.NewLogSocketHandler(postLog.GetLogBroadcaster())
-	http.HandleFunc("/system/getLogs", logHandler.Handle)
+	systemLogHandler := postLog.NewLogSocketHandler(postLog.GetLogBroadcaster())
+	http.HandleFunc("/system/getLogs", systemLogHandler.Handle)
 
 	http.HandleFunc("/register", RegisterHandler)
 	http.HandleFunc("/login", LoginHandler)
@@ -34,6 +35,7 @@ func setupRoutes() {
 	http.HandleFunc("/frpcAct/instanceMgr/restart", RestartInstanceHandler)
 	http.HandleFunc("/frpcAct/instanceMgr/status", GetInstanceStatusHandler)
 	http.HandleFunc("/frpcAct/instanceMgr/getInfo", GetInstanceInfoHandler)
+	http.HandleFunc("/frpcAct/instanceMgr/logs", frpLogger.NewInstanceLogHandler(ValidateTokenFromMap).ServeHTTP)
 	http.HandleFunc("/frpcAct/proxyMgr/create", CreateProxyHandler)
 	http.HandleFunc("/frpcAct/proxyMgr/delete", DeleteProxyHandler)
 	http.HandleFunc("/frpcAct/proxyMgr/list", ListProxiesHandler)