rename: 3x-ui/x-ui -> L-UI/l-ui/lui-agent (paths, services, env, assets)

Display L-UI; panel binary/process l-ui, agent lui-agent.
Dirs /usr/local/l-ui, /etc/l-ui, /var/log/l-ui; DB /etc/l-ui/l-ui.db
(name file drives it via GetName), probe.db beside it, cert
/etc/l-ui/cert, bin /usr/local/l-ui/bin. Services l-ui.service /
lui-agent.service, OpenRC lui-agent, l-ui.sh, cmd/lui-agent.
Env prefix XUI_ -> LUI_ (code reads new prefix only). Release
assets l-ui-linux-* / lui-agent-linux-*; Gitea repo rogue/l-ui is
a placeholder pending user confirmation (see selfupdate.go note).
Go module path github.com/mhsanaei/3x-ui/v3 intentionally kept.
Versions unchanged: panel V2.6.0 / agent A2.5.0.

cmd/lui-agent/main.go

@@ -1,4 +1,4 @@
-// Command xui-agent is the standalone Linux build of the 3x-ui node
+// Command lui-agent is the standalone Linux build of the L-UI node
 // agent (agent/panel split, phase 1). Until the split, nodes ran the
 // panel binary under the "agent" subcommand, shipping the whole web
 // panel and the embedded frontend to every node. This entry links only
@@ -8,7 +8,7 @@
 // replacement for it:
 //
 //   - invocation is unchanged: service units run
-//     "xui-agent agent [-config /etc/x-ui/agent.json]" (the bare
+//     "lui-agent agent [-config /etc/l-ui/agent.json]" (the bare
 //     "-config" form is also accepted for manual runs);
 //   - agent.json, the traffic baseline and the other state files keep
 //     their names, locations and formats;
@@ -61,7 +61,7 @@ func main() {
 	if len(args) > 0 && args[0] == "agent" {
 		args = args[1:]
 	} else if len(args) > 0 && args[0][0] != '-' {
-		fmt.Fprintf(os.Stderr, "xui-agent: unknown subcommand %q (this binary only runs the node agent)\n", args[0])
+		fmt.Fprintf(os.Stderr, "lui-agent: unknown subcommand %q (this binary only runs the node agent)\n", args[0])
 		os.Exit(2)
 	}
 
@@ -73,14 +73,14 @@ func main() {
 func runAgent(args []string) {
 	agentCmd := flag.NewFlagSet("agent", flag.ExitOnError)
 	var configPath string
-	agentCmd.StringVar(&configPath, "config", "/etc/x-ui/agent.json", "Path to agent config file")
+	agentCmd.StringVar(&configPath, "config", "/etc/l-ui/agent.json", "Path to agent config file")
 	agentCmd.Parse(args)
 
 	// Agent mode always uses the panel's directory layout for the
 	// xray binary, geo files and config.json. Scoped to agent mode
 	// only so the panel's own relative "bin" default is untouched.
-	if os.Getenv("XUI_BIN_FOLDER") == "" {
-		_ = os.Setenv("XUI_BIN_FOLDER", agent.DefaultBinFolder)
+	if os.Getenv("LUI_BIN_FOLDER") == "" {
+		_ = os.Setenv("LUI_BIN_FOLDER", agent.DefaultBinFolder)
 	}
 
 	cfg, err := agent.LoadConfig(configPath)
@@ -89,7 +89,7 @@ func runAgent(args []string) {
 	}
 
 	// The acknowledged traffic baseline persists next to the agent
-	// config (its state home, e.g. /etc/x-ui), unless the config
+	// config (its state home, e.g. /etc/l-ui), unless the config
 	// names a path.
 	if cfg.BaselinePath == "" {
 		cfg.BaselinePath = filepath.Join(filepath.Dir(configPath), "agent-traffic-baseline.json")
@@ -97,17 +97,17 @@ func runAgent(args []string) {
 
 	// Initialize logger
 	logger.InitLogger(logging.INFO)
-	log.Printf("Starting 3x-ui agent (node: %s)", cfg.NodeName)
+	log.Printf("Starting L-UI agent (node: %s)", cfg.NodeName)
 
 	// Agent memory profile (ITEM-P3 A1/M5): the same runtime tuning
 	// family as the panel, with the agent's tighter budget, plus the
 	// periodic release the panel runs through its job scheduler (the
-	// agent has no scheduler), plus the panel's XUI_PPROF gate.
+	// agent has no scheduler), plus the panel's LUI_PPROF gate.
 	for _, line := range memtuning.ApplyAgentMemoryTuning() {
 		log.Println(line)
 	}
 	memtuning.StartPeriodicMemoryRelease()
-	if os.Getenv("XUI_PPROF") == "true" {
+	if os.Getenv("LUI_PPROF") == "true" {
 		go func() {
 			log.Println("pprof profiling server listening on 127.0.0.1:6060")
 			if err := http.ListenAndServe("127.0.0.1:6060", nil); err != nil {