feat(hamlog): the settings panel, the key check, and a row-colour channel

HAMLOG.online is now reachable: Settings → External services → HAMLOG.ONLINE
takes the API key, the auto-upload switch and the timing, exactly like the six
services beside it, and a link opens the page where the key is issued.

The button next to it checks the KEY, not the connection. HAMLOG answers
KEYSTATUS with the callsign the key belongs to — something no other service
here offers — so the result reads "Key is valid — account F4BPO" rather than a
green tick. A key pasted from a club account or a second station is visible at
once, which is precisely the mistake a tick would have hidden.

No on-close timing, for the same reason as Cloudlog: there is no per-QSO upload
column to select a backlog from at shutdown, so the option would have done
nothing. Immediate or delayed, and a stored on_close falls back to immediate
rather than silently uploading nothing.

The appearance rules gain a HAMLOG.online channel too, so a row can be coloured
"confirmed" on that alone. It reads the ADIF extras — the standard names a field
for hamlog.EU and none for hamlog.ONLINE — using the same keys the award engine
reads, so the two can never disagree about what a confirmation is. "To send"
skips it: a QSO is either uploaded or not, there is no card to be owed.

appearance.go

@@ -19,7 +19,7 @@ type RowColorRule struct {
 	ID      string `json:"id"`
 	Color   string `json:"color"`
 	Enabled bool   `json:"enabled"`
-	// Channels this rule looks at: qsl (paper), lotw, eqsl, qrz.
+	// Channels this rule looks at: qsl (paper), lotw, eqsl, qrz, hamlog.
 	//
 	// Empty means ALL of them — what an operator expects from a rule they have
 	// not narrowed, and what keeps a config written before this field meaningful.
@@ -27,7 +27,7 @@ type RowColorRule struct {
 }
 
 // The QSL channels a rule can be scoped to.
-var rowColorChannels = []string{"qsl", "lotw", "eqsl", "qrz"}
+var rowColorChannels = []string{"qsl", "lotw", "eqsl", "qrz", "hamlog"}
 
 // RowColorSettings is the whole appearance block.
 type RowColorSettings struct {