P7: restore agent node type, agent heartbeat expiry, build-version injection, remove log/history/xray-metrics modules, optional sub port

- nodes: port node-type (traditional/agent) picker back from web-src into
  the embedded frontend; backend annotates NodeView.nodeType from
  agent_nodes bindings; fix agent-node update path (skip reachability
  probe and apiToken requirement for agent-managed nodes); restore i18n
  keys in all 13 locales; install command now uses the Gitea mirror
- jobs: expire agent-bound nodes whose agent_nodes.last_seen is older
  than max(3x heartbeat interval, 120s) = 180s; last_seen=0 (never
  registered) is left untouched; transitions reuse UpdateHeartbeat +
  node event broadcast
- config: GetBaseVersion honors ldflags-injected buildVersion; release
  builds inject 3.7.0-agent.1 so the panel no longer reports a phantom
  update against the Gitea release tag
- logger/server: remove the three log viewers (panel/xray/amneziawg),
  their API endpoints and the 10240-entry in-memory log buffer; file
  logging via lumberjack unchanged; tests assert via a new optional
  logger hook instead of the removed buffer
- server: remove system history and xray metrics modules end to end
  (endpoints, sampling appends in RefreshStatus, per-minute persist
  cron, gob snapshot/restore, XrayMetricsService); realtime status and
  per-node history are untouched
- settings: subPort may be 0/unset - subscription links are generated
  without a port while the subscription service keeps binding the
  default 2096; the settings form declares the cleared state via
  onNumber's new onClear option instead of snapping back to 1

internal/web/network/serve_test.go

@@ -11,6 +11,7 @@ import (
 	"path/filepath"
 	"runtime"
 	"strings"
+	"sync"
 	"testing"
 
 	"github.com/mhsanaei/3x-ui/v3/internal/logger"
@@ -27,11 +28,28 @@ type testAddr string
 func (a testAddr) Network() string { return string(a) }
 func (a testAddr) String() string  { return string(a) }
 
+// captureLogLines installs a logger hook collecting "LEVEL message" lines
+// for the rest of the test. It replaces reads of the in-memory log buffer,
+// which was removed together with the web log viewer.
+func captureLogLines(t *testing.T) *[]string {
+	t.Helper()
+	var mu sync.Mutex
+	lines := &[]string{}
+	prev := logger.SetLogHook(func(level, msg string) {
+		mu.Lock()
+		defer mu.Unlock()
+		*lines = append(*lines, level+" "+msg)
+	})
+	t.Cleanup(func() { logger.SetLogHook(prev) })
+	return lines
+}
+
 func TestServeHTTPLogsUnexpectedListenerFailure(t *testing.T) {
 	errInjected := errors.New("injected listener failure")
+	logLines := captureLogLines(t)
 	ServeHTTP(&http.Server{}, failingListener{err: errInjected}, "Test server")
 
-	for _, line := range logger.GetLogs(100, "error") {
+	for _, line := range *logLines {
 		if strings.Contains(line, errInjected.Error()) {
 			return
 		}
@@ -41,9 +59,10 @@ func TestServeHTTPLogsUnexpectedListenerFailure(t *testing.T) {
 
 func TestServeHTTPSuppressesNormalServerClose(t *testing.T) {
 	const marker = "normal-close-must-stay-silent"
+	logLines := captureLogLines(t)
 	ServeHTTP(&http.Server{}, failingListener{err: http.ErrServerClosed}, marker)
 
-	for _, line := range logger.GetLogs(100, "error") {
+	for _, line := range *logLines {
 		if strings.Contains(line, marker) {
 			t.Fatalf("normal http.ErrServerClosed was recorded as an error: %s", line)
 		}