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/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 {