fix: resolve merge conflicts and fix monitoring bugs

- Add missing 'uptime' field to NodeMetricApiItem type definition
- Fix WS message handling: non-UpgradeProgress typed messages now
  broadcast via broadcastInfo instead of being silently dropped
- Strengthen looksLikeSystemInfoMessage heuristic to require ≥3
  matching keys to avoid false positives
- Fix tab/space indentation inconsistency in admin.tsx useEffect
- Remove duplicate method declarations from merge (repository_control,
  mutations)
- Update tunnel_entry_sqlite_test to use renamed Tx suffix function

go-backend/internal/http/handler/mutations.go

@@ -4165,20 +4165,6 @@ func (h *Handler) validateForwardPortAvailability(node *nodeRecord, port int, cu
 	return nil
 }
 
-func (h *Handler) validateForwardPortAvailabilityTx(tx *gorm.DB, node *nodeRecord, port int, currentForwardID int64) error {
-	if h == nil || h.repo == nil || tx == nil || node == nil || port <= 0 {
-		return nil
-	}
-	occupied, err := h.repo.HasOtherForwardOnNodePortTx(tx, node.ID, port, currentForwardID)
-	if err != nil {
-		return err
-	}
-	if occupied {
-		return fmt.Errorf("节点 %s 端口 %d 已被其他转发占用", node.Name, port)
-	}
-	return nil
-}
-
 func parsePortRangeMinMax(input string) (int, int) {
 	input = strings.TrimSpace(input)
 	if input == "" {

go-backend/internal/http/handler/tunnel_entry_sqlite_test.go

@@ -83,7 +83,7 @@ func TestValidateTunnelEntryPortConflictsForNewEntriesDoesNotBlockOnSQLiteTx(t *
 	doneCh := make(chan struct{})
 	go func() {
 		defer close(doneCh)
-		errCh <- h.validateTunnelEntryPortConflictsForNewEntries(tx, tunnelID, []int64{oldEntryID}, []int64{oldEntryID, newEntryID})
+		errCh <- h.validateTunnelEntryPortConflictsForNewEntriesTx(tx, tunnelID, []int64{oldEntryID}, []int64{oldEntryID, newEntryID})
 	}()
 
 	select {