Set the bandmap spot timeout separately for CW/digital and phone

CW and digital spots time out after 10 minutes and phone spots after 30
by default, both settings on the telnet Filters tab. The mode comes from
the band plan; a frequency it has no boundaries for counts as phone.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tests/Nonemm.Spotting.Tests/BandmapTests.cs

@@ -18,6 +18,21 @@ public class BandmapTests
         Assert.Equal(["JA1XYZ", "DL1ABC"], map.On(Bands.Band20M).Select(s => s.Call.Text));
     }
 
+    [Fact]
+    public void EachSpotLivesAsLongAsItsOwnLifetime()
+    {
+        Bandmap map = new(clock: () => Now)
+        {
+            LifetimeFor = spot => TimeSpan.FromMinutes(spot.Frequency.Kilohertz < 14_100 ? 10 : 30),
+        };
+        map.Add(At("DL1ABC", 14_025));
+        map.Add(At("JA1XYZ", 14_200));
+
+        map.DropOlderThan(Now.AddMinutes(15));
+
+        Assert.Equal(["JA1XYZ"], map.All().Select(s => s.Call.Text));
+    }
+
     [Fact]
     public void AStationThatMovesKeepsOneEntryOnItsBand()
     {