feat: HAMLOG.online upload and confirmations, Yaesu antenna, a named port holder

HAMLOG.online is a seventh external service: one API key, one ADIF record per
QSO, immediate / delayed / on-close like the rest. They publish no API
documentation, so the protocol is read from THEIR OWN client — the HAMLOG Agent
(github.com/hamlogonline/Agent), which is the authoritative source short of
asking them:

	POST https://hamlog.online/api/agent/
	{"ADIFADD": {"APIKEY": k, "ADIFDATA": record}}   → {"STATUS":"OK"}
	{"KEYSTATUS": {"APIKEY": k}}                     → {"STATUS":"OK","CALLSIGN":…}

Success is STATUS == OK, not "no ERROR field": their failure carries ERROR and
no STATUS, and reading an unknown reply — a proxy page, a maintenance notice —
as an acceptance is how a contact goes missing without anyone noticing.

KEYSTATUS buys something no other service here offers: the key can be checked
BEFORE the first QSO, and the answer names the account. A key pasted from
another callsign is caught in the settings panel rather than through a week of
silent refusals.

Their confirmations are also an award source now, ticked like LoTW rather than
expressed through "custom". It reads the ADIF extras, not a column: the standard
names a field for hamlog.EU and none for hamlog.ONLINE, and borrowing the other
site's field would write a falsehood into every exported log. Three plausible
key names from their own export are accepted too, so nobody has to rename a
column by hand after an export.

Yaesu gains antenna selection (AN), remembered per band — the antenna picked on
a band comes back with it, with no table to fill in anywhere. Rigs with one
socket never answer AN and never show the row; the log says which case it is.

And a serial port that is refused now names its likely holder. OmniRig stays
resident once activated and keeps the port of the rig configured in it, so a
native backend never gets it — "Serial port busy" alone accused nobody, and an
FTDX10 spent a morning being blamed for it.

app.go

@@ -19882,6 +19882,86 @@ func (a *App) SetYaesuPreamp(n int) error {
 	return a.yaesuDo(func(y cat.YaesuController) error { return y.SetYaesuPreamp(n) })
 }
 
+// SetYaesuAntenna selects an antenna jack on a Yaesu, and REMEMBERS it for the
+// band the rig is on.
+//
+// No settings page for this, deliberately. A per-band antenna table is one more
+// form to fill in and one more menu to find, for a fact the operator states
+// perfectly well by choosing the antenna once on that band. So the choice is
+// learnt where it is made, and re-applied on the next visit — see
+// applyYaesuBandAntenna.
+func (a *App) SetYaesuAntenna(n int) error {
+	if err := a.yaesuDo(func(y cat.YaesuController) error { return y.SetYaesuAntenna(n) }); err != nil {
+		return err
+	}
+	if band := strings.ToLower(strings.TrimSpace(a.cat.State().Band)); band != "" && n > 0 {
+		m := a.yaesuBandAntennas()
+		if m[band] != n {
+			m[band] = n
+			a.saveYaesuBandAntennas(m)
+			applog.Printf("yaesu: antenna %d remembered for %s", n, band)
+		}
+	}
+	return nil
+}
+
+// keyYaesuBandAnt holds the learnt band → antenna map, as JSON.
+const keyYaesuBandAnt = "yaesu.band_antennas"
+
+func (a *App) yaesuBandAntennas() map[string]int {
+	out := map[string]int{}
+	if raw := a.settingOr(keyYaesuBandAnt, ""); raw != "" {
+		_ = json.Unmarshal([]byte(raw), &out)
+	}
+	return out
+}
+
+func (a *App) saveYaesuBandAntennas(m map[string]int) {
+	if b, err := json.Marshal(m); err == nil {
+		a.setSetting(keyYaesuBandAnt, string(b))
+	}
+}
+
+// GetYaesuBandAntennas exposes the learnt map, so the panel can show which band
+// carries which antenna without the operator having to change band to find out.
+func (a *App) GetYaesuBandAntennas() map[string]int { return a.yaesuBandAntennas() }
+
+// ForgetYaesuBandAntenna drops the memory for one band — the way to undo a
+// choice made by mistake, without a table to edit.
+func (a *App) ForgetYaesuBandAntenna(band string) {
+	m := a.yaesuBandAntennas()
+	delete(m, strings.ToLower(strings.TrimSpace(band)))
+	a.saveYaesuBandAntennas(m)
+}
+
+// YaesuApplyBandAntenna is applyYaesuBandAntenna as a binding, called from the
+// same place the Flex one is — a band change or a spot click.
+func (a *App) YaesuApplyBandAntenna(band string) error {
+	a.applyYaesuBandAntenna(band)
+	return nil
+}
+
+// applyYaesuBandAntenna puts the remembered antenna back when the rig changes
+// band. Silent when nothing was ever learnt for it: an operator who has not
+// expressed a preference for 17 m must not have their antenna moved.
+func (a *App) applyYaesuBandAntenna(band string) {
+	b := strings.ToLower(strings.TrimSpace(band))
+	if b == "" || a.cat == nil {
+		return
+	}
+	want := a.yaesuBandAntennas()[b]
+	if want <= 0 {
+		return
+	}
+	_ = a.cat.YaesuDo(func(y cat.YaesuController) error {
+		if st := y.YaesuState(); st.Antenna == want || st.Antenna == 0 {
+			return nil // already there, or a rig with a single socket
+		}
+		applog.Printf("yaesu: band %s → antenna %d (remembered)", b, want)
+		return y.SetYaesuAntenna(want)
+	})
+}
+
 func (a *App) SetYaesuAtt(db int) error {
 	return a.yaesuDo(func(y cat.YaesuController) error { return y.SetYaesuAtt(db) })
 }